Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a86b6b0bfb61db1…

MALICIOUS

PDF

72.8 KB Created: 2021-02-27 01:49:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 940a678b6838e4b89408f90c8659a721 SHA-1: ea40ace83b811dc874e6afb7203191382a60703a SHA-256: 5a86b6b0bfb61db1202b1a33c3c3ac88dd2305cc9064c73050a7aa6a8e86aa3e
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=willmington%2527s+guide+to+the+bible+online PDF link annotation
    • https://cdn.sqhk.co/nurafurofopu/BkOhhNS/latedititoperazagemozu.pdfIn PDF document text
    • https://cdn.sqhk.co/feripamapuv/6RFlNbH/xepozusotafagek.pdfIn PDF document text
    • http://baugroup.info/what_to_look_for_when_buying_a_laptop_for_work25cn5.pdfIn PDF document text
    • http://kataeta.club/roxofezuvlsrge.pdfIn PDF document text
    • http://tafugegajotu.mygamesonline.org/bolidovegojamawof.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/pentax_k30_vs_k500.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454966/normal_6020d3a6ae9c0.pdfIn PDF document text
    • http://lorenbayi.com/299619002241mme7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496816/normal_5fd03bbe339d3.pdfIn PDF document text
    • http://leopolds.space/boy_scout_oath_and_law_english_and_tagalog3gxfq.pdfIn PDF document text
    • http://poradoit1.site/disc_assessment_questions_and_answersf286b.pdfIn PDF document text
    • http://hookup153.fun/89401577390mngnk.pdfIn PDF document text
    • http://damvglaz0.xyz/61616647666trj4t.pdfIn PDF document text
    • https://pdfnations.com/082541874In 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_off0000dfcf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFCF 5120 bytes
SHA-256: 1deef0a48f56228c3ba9fcef0b0975299d72a7b4d3aaaf76370537a1da2e1e96
font_01_sfnt_off0000f127.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 10912 bytes
SHA-256: 98f5cccd1ef5eb62fa98cb5b684b8afc7919681952502ac8721970397b292f11

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