Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f6a118c9b12b69a…

MALICIOUS

PDF

76.9 KB Created: 2021-03-24 12:54:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d826840406f82369ace56506e58cf0af SHA-1: 2958501c0b8536ca85f20ae1b70043b46992c0cc SHA-256: 5f6a118c9b12b69afa71719865bc766b8d33bbee7e8b402f12a78ece8bc68c3a
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV and ML classifiers identified this PDF as malicious, specifically as a phishing trojan. The embedded URLs suggest an attempt to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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.
  • 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://mezovuduw.ru/strik?utm_term=what+is+the+best+commercial+backpack+leaf+blower PDF link annotation
    • http://nesakud.mypressonline.com/honeywell_hcm_350_germ_free_cool_mist_humidifier_white.pdfIn PDF document text
    • http://gakawisogafuga.mygamesonline.org/2003_saturn_vue_transmission_control_module.pdfIn PDF document text
    • http://didazema.mypressonline.com/jevodanexareveza.pdfIn PDF document text
    • http://nenonazuf.scienceontheweb.net/lenexipupaxoxaloxowiser.pdfIn PDF document text
    • https://cdn.sqhk.co/gijesali/xU1gg2I/voxufa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446649/normal_5fe8d2d7da57e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382187/normal_603026a9d3042.pdfIn PDF document text
    • http://gexopidikimo.mygamesonline.org/medical_english_dialogues.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381094/normal_60330c1d818a5.pdfIn PDF document text
    • http://lirebuwoke.mygamesonline.org/webovifosovotegukobuzalot.pdfIn PDF document text
    • http://zanovekolasin.mywebcommunity.org/zizuminurodemigenurefe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426416/normal_5fde718b09c12.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/fjujbU2/market_gardener_masterclass_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_22e09540ab4449fb9185961b1cff0cb0.pdf?index=trueIn PDF document text
    • https://ca39a19f-16f9-469f-ab0b-65ec0463b8d0.filesusr.com/ugd/cc9b97_a4e838c221c740adb97aca1bc5ce819e.pdf?index=trueIn PDF document text
    • https://a82c121c-2200-4cd7-aff6-47cf910fdadb.filesusr.com/ugd/117c17_6b302c3252544058825dd26adc6c8ff0.pdf?index=trueIn PDF document text
    • https://3485775d-af35-4505-8fb4-f6750f575e04.filesusr.com/ugd/42f18e_55403e34c89d43c1bc500776d95f2e18.pdf?index=trueIn PDF document text
    • https://d992f69e-bc5b-430a-92d7-abfd66d0380b.filesusr.com/ugd/6f7357_f0baf355e94c4028b74d709f5189a4ee.pdf?index=trueIn PDF document text
    • https://a49a6154-edc8-4132-95a2-c7bb8d673fe9.filesusr.com/ugd/551169_0fa15d372eb64fb2b09f38d098d3716e.pdf?index=trueIn PDF document text
    • https://4cd5a77a-be8d-44ba-8952-4177873115c4.filesusr.com/ugd/930050_43236371ffae4f2884a51a47dbfdd739.pdf?index=trueIn PDF document text
    • https://8f0c9b82-9570-4081-bbb7-5e23a534ea09.filesusr.com/ugd/7008f3_fdc9bda6fb0045118d0f46809b1f13ed.pdf?index=trueIn PDF document text
    • http://tavoxelelenasi.onlinewebshop.net/64583155390.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_off0000ed20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED20 5564 bytes
SHA-256: c815576bf0d1c60f6e9c33f5822b6d01b6046e1ad1675c896b2d5d11901e675c
font_01_sfnt_off0000fff6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF6 10984 bytes
SHA-256: 35506920d03a2f30217fd78ec7df154d90484aad2a6aaba4f10eee55cd756b79