Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1976469e985597e…

MALICIOUS

PDF

113.8 KB Created: 2021-02-26 23:49:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: e4486abd5f4a6586a88ddd653aa4d5b3 SHA-1: b85a3e3a81965c1630db37f76dcb3afc58acb8dd SHA-256: d1976469e985597efd49002b8102b5be250cef18d90f025da58419c4fb90ce10
186 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm and a lure for recovery secrets or private keys. It embeds multiple URLs, some of which point to disposable hosting, suggesting a phishing or scam attempt. The ML classifier and ClamAV detection further support its malicious nature.

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://bologen.ru/wix?keyword=lynx+plus+l3000+programming+guide PDF link annotation
    • https://rulafowobunafo.weebly.com/uploads/1/3/5/3/135391395/f72216545cfaf42.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499984/normal_6018db5321201.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/serid.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489247/normal_60319a4c81ae2.pdfIn PDF document text
    • http://xodaxedepapopox.mygamesonline.org/spelling_book_5th_grade.pdfIn PDF document text
    • http://bagomebefekixob.getenjoyment.net/toro_ccr_2000e_owners_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_602a9700b2439.pdfIn PDF document text
    • http://nuloriwilorij.scienceontheweb.net/english_grammar_in_use_elementary_fifth_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477877/normal_602ad6cce00ff.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://widusop.atwebpages.com/49167086297.pdfIn PDF document text
    • https://s3.amazonaws.com/jezekemunidup/pumadenapek.pdfIn PDF document text
    • https://s3.amazonaws.com/bokofapig/aashiyan_barfi_instrumental_song_free.pdfIn PDF document text
    • https://s3.amazonaws.com/firudegix/marathi_fonts_for_ms_office_2016.pdfIn PDF document text
    • https://s3.amazonaws.com/tazopaju/sluice_gate_valve_data_sheet.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_off00017414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17414 5696 bytes
SHA-256: 0ca5232053522a457ae4faf1808ad7bbd87f4d047512abada32b7f3ed027c172
font_01_sfnt_off00018772.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18772 16640 bytes
SHA-256: a015f8c25051d3f1027f6f34d3bda04babf7f52b13a981f282f1a661a6674987

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