Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ddcf9d8f2b1dfa0…

MALICIOUS

PDF

79.7 KB Created: 2021-03-21 01:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: bdb6ecca77325b6707ebc607286c98ca SHA-1: abc91ce80d5657a877b3dd1f6aba7d525e85bfa9 SHA-256: 3ddcf9d8f2b1dfa0b16de0798741ffbbd18faded5fbbc848afee77a4c827ddea
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics as malicious, including a high-confidence ML classifier and ClamAV detection. It contains suspicious links, one of which is invisible and points to a domain associated with link farming. The document also employs urgency and password-protected archive lures, suggesting an attempt to bypass security controls and trick the user into executing a payload. The presence of embedded URLs and the overall structure indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 9

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://xezojetit.ru/aws?utm_term=dixie+chopper+customer+service PDF link annotation
    • http://fiwetud.scienceontheweb.net/giberokujejiroza.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382973/normal_5fe2ca2657092.pdfIn PDF document text
    • https://besuxape.weebly.com/uploads/1/3/4/3/134374749/tinovubomu.pdfIn PDF document text
    • http://gejejasofubi.mywebcommunity.org/city_of_endless_night.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369506/normal_603fc1e862838.pdfIn PDF document text
    • http://vadanunagirira.getenjoyment.net/reaccion_acneiforme_tratamiento.pdfIn PDF document text
    • http://rastet-malysh.ru/tezanesebejaxudifomak69.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwoxegolewa/YQijXih/among_us_free_play_online_now.pdfIn PDF document text
    • http://ig-supportcenter.xyz/giardia_treatment_guidelinesbqhv2.pdfIn PDF document text
    • https://cdn.sqhk.co/xikokopek/fPdhiWX/tenuku.pdfIn PDF document text
    • https://cdn.sqhk.co/gasalikuviz/7HNgjSr/california_weed_farms_jobs.pdfIn PDF document text
    • http://lamaded.mywebcommunity.org/rumakepajekof.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457298/normal_5ff513aad43d9.pdfIn PDF document text
    • http://arfesopt.com/how_to_run_a_tig_weldernvnkw.pdfIn PDF document text
    • http://shoop-fm.ru/wirewivudujf6k8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449183/normal_6041a4e76be58.pdfIn PDF document text
    • https://sejixegagetuta.weebly.com/uploads/1/3/0/9/130969850/bafadis_keseg_tomudelabebawi.pdfIn PDF document text
    • http://datab.vip/tidikofv8no.pdfIn PDF document text
    • https://cdn.sqhk.co/gaxudofexal/O3hh2hj/merriam_webster_vocabulary_builder_file_type.pdfIn PDF document text
    • https://cdn.sqhk.co/jerowerar/brhbHgj/pidotanotefur.pdfIn PDF document text
    • http://leporabev.mywebcommunity.org/xedumalozomevatutobad.pdfIn PDF document text
    • https://xalemutaxites.weebly.com/uploads/1/3/0/9/130969461/6329617.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a31741d-e0b7-4c22-bf97-424a5a168c39/gk_chesterton_orthodoxy_study_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f00f879b-e8e2-487b-a7d3-e015843a9010/luvuvutizoduzaruk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/825b1687-4eb6-4ad7-bc9c-d11ab4acc0a0/maths_puzzles_and_riddles_for_class_6_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/695e3678-4dd7-45fb-a8f6-bb289701ae90/tilevitojawam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/902e108b-accf-407d-9fb9-14144aeb4d24/dish_network_internet_speeds_and_prices.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f9eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9EB 5060 bytes
SHA-256: a1f715a054dc41242ad62afba7a158d8c36d7903a08b6ec8c6057b49e621d372
font_01_sfnt_off00010b07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B07 11300 bytes
SHA-256: e18247f34a9509fd3ef612ef5e8d163ff66f7fe0fc23ea24574af6f48ebf1840