Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b2f9be55ed031d1…

MALICIOUS

PDF

80.5 KB Created: 2021-06-03 05:00:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 4c477e23792b7244566ffc3b955f9efe SHA-1: 8fa1a9bd551959f94bf74bbc2a45632df2542fc0 SHA-256: 1b2f9be55ed031d11f82a8c4b1114657b9f3f0c91459aaad1e4f64d1ced55687
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, which is a common tactic for SEO manipulation or directing users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs suggests the primary goal is to redirect the user to potentially harmful content.

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 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.
  • 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://irlanc.ru/pbw?utm_term=master+asl+level+one+unit+6+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4365552/normal_601787bc40539.pdfIn PDF document text
    • https://wadidomewagu.weebly.com/uploads/1/3/2/6/132681938/4626840.pdfIn PDF document text
    • https://sizolofowexowar.weebly.com/uploads/1/3/5/3/135350689/f07149e7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482623/normal_602b0f5e7b34a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372707/normal_5ff353762439a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500199/normal_601e8e94c8f92.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420604/normal_5fcb971ad999a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383574/normal_5fe21028a0566.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482882/normal_5fc5bf19c3e34.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501501/normal_5ff4c3a96a660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412900/normal_6027c6cda6e47.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459174/normal_605dae53e8d1f.pdfIn PDF document text
    • https://miwimuwal.weebly.com/uploads/1/3/0/7/130775744/gafazinewokovekumime.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461511/normal_600a3e6994bee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421776/normal_60b833b862097.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455914/normal_602e811cbc406.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393204/normal_6012bb3136f95.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471996/normal_602bf388472a1.pdfIn PDF document text
    • https://fuzujaloxoz.weebly.com/uploads/1/3/4/6/134684853/a9d8bcc45fcc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420764/normal_6000057a19149.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_off0000fac4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC4 5252 bytes
SHA-256: 8ff8faf513391362b4f6e62fa4c3f0efc7af4143c098b41ef39ea2fcaa0213de
font_01_sfnt_off00010cc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CC3 11116 bytes
SHA-256: e7f3e6336f592c3a5c9d0cf7e01f82831a87c8e3272cf6ee9fe5ebff009c5813

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