Malicious PDF — malware analysis report

Static analysis result for SHA-256 b2f56863ed480a9c…

MALICIOUS

PDF

92.8 KB Created: 2021-03-11 22:00:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 5fb8dd96fc8d5445f932e77c3030b4e7 SHA-1: 9d1c0351d08ee95247be70ccb5328d3e734c92c3 SHA-256: b2f56863ed480a9cf7c5bb336e4d1cf36d1f7163978ae78627fc4697dfb164a7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, exhibiting characteristics of a link farm. It contains numerous external URIs, including one pointing to 'seumenha.ru' with a keyword suggesting a lure for game-related content. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, suggesting a coordinated effort to distribute malicious content or redirect users to phishing sites. No scripts were extracted, but the presence of numerous external links implies an intent to lead the user to malicious content hosted elsewhere.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://seumenha.ru/wix?keyword=binding+of+isaac+full+game+online+unblocked PDF link annotation
    • https://nozagovedenide.weebly.com/uploads/1/3/2/6/132682533/210793.pdfIn PDF document text
    • https://cdn.sqhk.co/serodozire/ggihGjg/70292756028.pdfIn PDF document text
    • http://groby-ritual.online/412008119635y70b.pdfIn PDF document text
    • http://strapslap.online/turning_operation_on_lathe_machine_is_done_byrv6kl.pdfIn PDF document text
    • http://noksipals.online/258397969849ihsq.pdfIn PDF document text
    • http://pshcomonhere.xyz/gopidegibogavimejabijd8k57.pdfIn PDF document text
    • https://cdn.sqhk.co/daribugubive/y7cjdjg/16682231302.pdfIn PDF document text
    • https://lavovozanu.weebly.com/uploads/1/3/0/7/130739022/xuzizezod.pdfIn PDF document text
    • https://cdn.sqhk.co/bovefonot/geAimgi/67539114544.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499334/normal_5fc8b3822a435.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaku/1iigeib/kenda_mountain_bike_tires_26_x_2._10.pdfIn PDF document text
    • http://mydenverneighborhoods.com/just_mercy_book_amazon6knen.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402737/normal_5fcdde5ac8fa9.pdfIn PDF document text
    • https://xuzowezawejinat.weebly.com/uploads/1/3/4/3/134378303/kevidomabaruda_tatokaxap_tipuzabawezif_rupejebug.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368249/normal_6041ce35b7676.pdfIn PDF document text
    • http://wordsideget.top/xuzefijamubukokakklc5b.pdfIn PDF document text
    • https://cdn.sqhk.co/bapinero/hgH5STy/leadership_skills_resume_examples.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495413/normal_5fceefef3d6ad.pdfIn PDF document text
    • http://qwertyujg.xyz/danitutumozipawurexciw3n.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413966/normal_5fcd2734b66d7.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/ridafugafelosu-sokunojune.pdfIn PDF document text
    • https://cdn.sqhk.co/vudupapuj/qHDMehe/62611070298.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off00012d9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D9A 5500 bytes
SHA-256: 7a93e066068b56bdfe05f3695f28da8bc2bc9266af70fe10dd24dd4f6de63fe4
font_01_sfnt_off0001404d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1404D 10860 bytes
SHA-256: f6224b0ed7ae24e31f0e1f273e4267add8b4e9afadf9d8aa2732af477ad57946