Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f333845febeaee…

MALICIOUS

PDF

113.0 KB Created: 2021-02-25 08:07:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 5ee8e0523419791673e895b552cbc527 SHA-1: 7c85b8be21b3136ef09c30154eca45e1e17f2f0c SHA-256: a0f333845febeaeeabad1796d37376b0a16c047448e2259671c2d267c649dc97
246 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file exhibits characteristics of a phishing and SEO link farm attack. It contains a large number of external links, many pointing to disposable domains, suggesting an attempt to manipulate search engine results or redirect users to malicious content. The 'Password-protected archive handoff' heuristic indicates a common tactic to bypass security scanners by encrypting the actual payload, which is then revealed via a password provided in the document. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 8

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • 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://jottigo.ru/award?keyword=pe+exam+registration+april+2020 PDF link annotation
    • https://cdn.sqhk.co/lafuwexale/5hjjejh/zed_runes_mobafire.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/kTXhhKF/downloader_for_tiktok_video_videos.pdfIn PDF document text
    • http://aarbuz.space/warframe_kubrow_namesfxjo0.pdfIn PDF document text
    • http://tipografiyav.moscow/abnormal_psychology_an_integrative_approach_1st_south_african_editionjyoat.pdfIn PDF document text
    • http://getchambre.xyz/41946391557ro5d4.pdfIn PDF document text
    • https://cdn.sqhk.co/rolileduvof/jaxKujg/32903225961.pdfIn PDF document text
    • https://tamaxanafe.weebly.com/uploads/1/3/1/8/131856242/xanoxesotiz.pdfIn PDF document text
    • http://ita-bio.space/fitting_workshop_report_procedureji8da.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/ssc_stenographer_book_free_downloadt9zdf.pdfIn PDF document text
    • http://sigipotewal.22web.org/jazitidedejisoz.pdfIn PDF document text
    • https://cdn.sqhk.co/ditutafewaw/NNHhije/toca_nature_game_free.pdfIn PDF document text
    • https://cdn.sqhk.co/mitejapeki/jh4SZgg/restaurant_story_vegan_stove_parts.pdfIn PDF document text
    • https://rogejizerabori.weebly.com/uploads/1/3/4/7/134763318/7a5d744b5.pdfIn PDF document text
    • https://labajilawuja.weebly.com/uploads/1/3/1/4/131406369/8277d7568c12.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tibanepoxilibud/jisasatasiv.pdfIn PDF document text
    • http://vimixof.onlinewebshop.net/35202701073.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/vigatedeji.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/baaghi_theme_song_ringtone.pdfIn PDF document text
    • http://ranokevizo.rf.gd/android_payload_in_termux.pdfIn PDF document text
    • https://s3.amazonaws.com/xupimaral/answers_pet_food_calculator.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_off00017372.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17372 5484 bytes
SHA-256: c06eadaf6178cd6afcffab983c0464f0c77792450133f32b5d5a2c6e188a0494
font_01_sfnt_off0001860b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1860B 15664 bytes
SHA-256: 7a03ca1576bb9975be3f4e14ae8be1d943e95e1c77a353d33c16a44da3c03606