Malicious PDF — malware analysis report

Static analysis result for SHA-256 d101ff88054f0c0d…

MALICIOUS

PDF

75.0 KB Created: 2021-03-25 18:14:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 014cb6536503501ff0ce406b11b764c1 SHA-1: c25ef6b630e066cd7886f385acf0e6339c54ea65 SHA-256: d101ff88054f0c0dcee476592a90e86a1c33fe6c4befb82de3c362d07a4c6baf
186 Risk Score

Malware Insights

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

The sample was flagged by multiple heuristics, including ML classification and ClamAV, indicating malicious intent. The 'SE_SECRET_RECOVERY_LURE' heuristic strongly suggests the document's purpose is to trick users into revealing sensitive information like recovery phrases or private keys. The embedded URLs point to domains associated with link farms and potentially malicious content, further supporting a phishing or credential harvesting attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Recovery secret / private key request critical SE_SECRET_RECOVERY_LURE
    Document requests recovery phrases, private keys, backup codes, or saved passwords. Requests for these secrets in a document are high-risk.
  • 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://leonvi.ru/wix?keyword=les+bolstad+golf+lessons PDF link annotation
    • http://tulumiv.medianewsonline.com/vodok.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/bSjdtJK/how_to_cook_spaghetti_squash_noodles_on_stove.pdfIn PDF document text
    • https://cdn.sqhk.co/bexefoboxevi/MlTjdhg/gulikipilivusefunodoza.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/gejegdf/kodiak_bear_bites_cinnamon.pdfIn PDF document text
    • https://cdn.sqhk.co/baxoladipezu/ghgmkih/4runner_for_sale_by_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383561/normal_6030788c2fdd9.pdfIn PDF document text
    • http://noxaduva.mypressonline.com/better_man_tab.pdfIn PDF document text
    • http://wijasagasipode.getenjoyment.net/neoliberalismo_historia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366339/normal_604513c2bd720.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406466/normal_60392ef8c4c3b.pdfIn PDF document text
    • http://lulopoboxefon.scienceontheweb.net/adhesive_capsulitis_protocol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384048/normal_5fcea359704e4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393624/normal_6001cef793d1c.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/vidadaviwal/robotica_gratis.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/how_to_get_facebook_recovery_codes.pdfIn PDF document text
    • http://juludiripo.myartsonline.com/water_content_test_of_bitumen.pdfIn PDF document text
    • https://s3.amazonaws.com/juliziwojatige/rakunokefupidirame.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_off0000e7b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 5060 bytes
SHA-256: 4379c655430c5ec1087934580e375973199367fe78df3be3e5d3f26c9a53f328
font_01_sfnt_off0000f903.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF903 11192 bytes
SHA-256: 3934818d4c92cb123f6336f3de7ffc14edcd1f62a63b02e488e043e98d5c9312

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