Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed6712bc9152acf4…

MALICIOUS

PDF

78.4 KB Created: 2021-06-08 13:58:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: b400ab93d9e61bd9b1e0d57c383fa885 SHA-1: 5b2bf909fb0ba4c0d3cfb57f6298759f00d0f266 SHA-256: ed6712bc9152acf418e53a617c02306b2916cac2fedc6b553ee8a731feba6862
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 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
  • 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://pixomot.ru/pbw?utm_term=ev+yap%25C4%25B1m%25C4%25B1+bir+para%25C5%259F%25C3%25BCt+epub PDF link annotation
    • https://baxinumep.weebly.com/uploads/1/3/4/3/134366260/rasaf.pdfIn PDF document text
    • https://ritajixudigozik.weebly.com/uploads/1/3/5/3/135345652/vogepobot.pdfIn PDF document text
    • https://livupojinobiz.weebly.com/uploads/1/3/1/8/131856358/3864958.pdfIn PDF document text
    • https://lotefexikig.weebly.com/uploads/1/3/4/0/134097130/0e765a1929a.pdfIn PDF document text
    • https://texevipabel.weebly.com/uploads/1/3/4/6/134679186/sebogifekolesoda.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423133/normal_5fd16e3f064b1.pdfIn PDF document text
    • https://nojupifidupo.weebly.com/uploads/1/3/4/3/134361410/7f3595b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374852/normal_6026d3b0d5265.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://doxawadar.pbworks.com/w/file/fetch/144816177/druid_animal_oracle_swan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/83697fdc-acfa-4146-ad75-e8f8336f2e7e/juvemuseged.pdfIn PDF document text
    • http://lopofemusun.pbworks.com/w/file/fetch/144503451/nijuk.pdfIn PDF document text
    • http://tarogifere.pbworks.com/f/77546210051.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/dopotikixexot.pdfIn PDF document text
    • http://tiduxikuve.pbworks.com/w/file/fetch/144696279/ariston_gas_cooker_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48bac299-da19-4878-bd2b-7d8d3d455014/introduction_to_econometrics_5th_edition.pdfIn PDF document text
    • http://goxuluk.pbworks.com/w/file/fetch/144793977/fizazepalojomisozogesu.pdfIn PDF document text
    • http://jesababa.pbworks.com/f/lilutixazavasikope.pdfIn PDF document text
    • http://lonazetubuz.pbworks.com/w/file/fetch/144675309/57920125269.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_off0000f16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF16C 5416 bytes
SHA-256: b8376ea0036facd625e0ecc98a99487747ce22dd1ae781afa04e22879acfefac
font_01_sfnt_off00010398.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10398 12504 bytes
SHA-256: 4b9d5a9067cf2b6f5f257660ce9810134de5025b33031b5af5e2b643d5dcea19

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