Malicious PDF — malware analysis report

Static analysis result for SHA-256 7afaf6ccf6f032fa…

MALICIOUS

PDF

72.5 KB Created: 2021-03-03 14:55:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a88edfcf822724593a2e507948b0f0a7 SHA-1: 960cc41d7d3705b02bf0722494346afa1eafec62 SHA-256: 7afaf6ccf6f032fa24ef93f20484fa3cb10a02903220099d836b7d4fe64807f9
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://vilenefex.ru/wix?keyword=the+skin+i%2527m+in+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374022/normal_603f65177a9f0.pdfIn PDF document text
    • http://fizebiredasibi.mypressonline.com/vunel.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410016/normal_5fe531213f2e6.pdfIn PDF document text
    • https://cdn.sqhk.co/bajipugotox/iihexCN/51180697835.pdfIn PDF document text
    • http://prod-fruit.space/electronics_all-in-one_for_dummiesia0eu.pdfIn PDF document text
    • https://cdn.sqhk.co/jurugaguvedu/N0Bjjgk/space_racers_coloring_pages.pdfIn PDF document text
    • https://cdn.sqhk.co/penutizufib/kgjrjhr/metronome_beats_pro_app.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458856/normal_5fdd6993b34a0.pdfIn PDF document text
    • http://evilcheats.fun/narcissus_and_goldmund_2020_streamingfhnfr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402533/normal_5fc9362599361.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/dagasopones/21770324177.pdfIn PDF document text
    • https://s3.amazonaws.com/sonutopexaramuf/fetinevaretilosalido.pdfIn PDF document text
    • http://resilasijajatil.myartsonline.com/g_shock_watch_lt_meaning.pdfIn PDF document text
    • https://s3.amazonaws.com/lemerisinivum/51185279822.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_off0000e124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE124 4992 bytes
SHA-256: 1ca5c8eddb6733ea3b74163713fab3fe141f6d83df833d82cbd3e0ed259a41a9
font_01_sfnt_off0000f207.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF207 10224 bytes
SHA-256: fc6d479287d57ff6060b9660d059ca3e8695a9be3073877f0c9b0a639e293738

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