Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b07fc64bf8d9b5e…

MALICIOUS

PDF

75.4 KB Created: 2021-05-19 13:24:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 78d585b5de47e66fae77cdf9051bb0e7 SHA-1: 2df6a0aea1ae4beb42f24b4c920761acf473d6b2 SHA-256: 3b07fc64bf8d9b5ef14a6fee4a47836c1c910bf8e31c5d7699fbff88a0358d2f
126 Risk Score

Malware Insights

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

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many hosted on disposable domains, which are likely used to redirect users to malicious sites. The document body, though heavily obfuscated, suggests a lure related to a prayer book, indicating a social engineering attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://pelibifir.ru/strik?utm_term=release+me+oh+lord+prayer+book+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4451940/normal_600e7a919fb4c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381094/normal_5fe066f310d5d.pdfIn PDF document text
    • https://sulogifobib.weebly.com/uploads/1/3/5/3/135322722/ae770.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502833/normal_604ef71be36c9.pdfIn PDF document text
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/dimira.pdfIn PDF document text
    • https://runanusug.weebly.com/uploads/1/3/5/3/135313332/2429595.pdfIn PDF document text
    • https://mosodujisar.weebly.com/uploads/1/3/0/7/130739504/5665318.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497395/normal_601936c900769.pdfIn PDF document text
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/6bf91527a021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378157/normal_601fc647d2907.pdfIn PDF document text
    • https://kukitame.weebly.com/uploads/1/3/1/3/131379641/2802366.pdfIn PDF document text
    • https://vasuxuduka.weebly.com/uploads/1/3/4/3/134322555/tepesidozufuzo-rewazugupen-noludavev.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368770/normal_602d0a94dfd1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483104/normal_5fe395c04e0aa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_602fd82f31c06.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/sesafefanulokam/xeliru.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/drawing_ebooks_free.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_off0000e733.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE733 5596 bytes
SHA-256: 761642605d02b0562b1fd26e02766df5626ff08df7ad75d8ea6b0cc333e340bb
font_01_sfnt_off0000fa12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA12 12408 bytes
SHA-256: fae6335368de83fb55b7252a5900daa79cde56864441ad92eafc0731a981f2f2

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