Malicious PDF — malware analysis report

Static analysis result for SHA-256 6bf4ead7dc98af0a…

MALICIOUS

PDF

81.3 KB Created: 2021-05-11 13:46:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c888e6c41dc230ddcae48d9b1d3df57a SHA-1: 0134a5345b4172b2558edd70e359e8dfc138a03a SHA-256: 6bf4ead7dc98af0ab15dbb68fa8e212440b9fec5b44ce97f2aba53eafd5d75c1
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan payload. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious content. While no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to exploit vulnerabilities or trick users into visiting a malicious site.

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://static.s123-cdn-static.com/uploads/4449615/normal_5fdeb998ba8d9.pdf In PDF document text
    • http://gusevoxuzuwelap.mywebcommunity.org/69141792917.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477651/normal_5fe14669355f3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424331/normal_6056ca50970c7.pdfIn PDF document text
    • https://tixedasuke.weebly.com/uploads/1/3/5/9/135979549/pojuxisasubisujuwak.pdfIn PDF document text
    • http://xatakafigudu.getenjoyment.net/nadodivixigu.pdfIn PDF document text
    • http://ponaxamewimenul.sportsontheweb.net/fupurofuxuzaki.pdfIn PDF document text
    • https://cdn.sqhk.co/remudejifi/ivasheE/the_chosen_app_for_windows_10.pdfIn PDF document text
    • http://zapitexidij.mypressonline.com/what_is_the_difference_between_milwaukee_m12_batteries.pdfIn PDF document text
    • https://cdn.sqhk.co/wexifidobafo/mBAggHc/movie_quiz_2018_with_answers_level_4.pdfIn PDF document text
    • https://zusikoxapumobib.weebly.com/uploads/1/3/4/7/134766975/7124724.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_6059bb2d0b4db.pdfIn PDF document text
    • http://konalofasu.mywebcommunity.org/974128295.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/vAIYpVcV8Aw/wb?keyword=what%20do%20simcoe%20hops%20taste%20likePDF link annotation
    • http://wokidomogu.onlinewebshop.net/64278064768.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/sekajuwik.pdfIn PDF document text
    • https://s3.amazonaws.com/lowebemuwojiso/rheem_22v40f1_specs.pdfIn PDF document text
    • http://kewetanetoza.atwebpages.com/59598310885.pdfIn PDF document text
    • http://wugujub.onlinewebshop.net/38750156746.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_off000100e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E8 5292 bytes
SHA-256: f15c73b57d01df2a883d00562c9fd9d6cb8c8d37366e9a45b2d144c0517b80c2
font_01_sfnt_off000112d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112D2 11060 bytes
SHA-256: 24fb496613e9d9f2f022032410b24ce0e94ffeffc8c868e10f086350676210b8

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