Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef29605e85e6c8c2…

MALICIOUS

PDF

80.3 KB Created: 2021-06-13 22:23:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b19cf88a25d0d97d16229b1a37c6b4d0 SHA-1: 0a39ca047866b0a4f1cf795fac21b0dfa5818d6e SHA-256: ef29605e85e6c8c2b1d73e6495675729af5cf6323c6b8d619010b690975b4cc1
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, identified as a PDF link farm. The primary URL, 'https://laborke.ru/pbw?utm_term=displacement+reaction+worksheet', suggests a lure related to educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to malicious sites or for SEO spam.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://laborke.ru/pbw?utm_term=displacement+reaction+worksheet
    • https://static.s123-cdn-static-d.com/uploads/4412773/normal_60b6a1d23e33e.pdf
    • https://cdn-cms.f-static.net/uploads/4401712/normal_5fd82af823f96.pdf
    • https://munulokepopat.weebly.com/uploads/1/3/5/2/135297381/xosonide.pdf
    • https://static.s123-cdn-static.com/uploads/4472188/normal_5fe06c8661000.pdf
    • https://cdn-cms.f-static.net/uploads/4420431/normal_606c9285f3171.pdf
    • https://cdn-cms.f-static.net/uploads/4454977/normal_605232af09a11.pdf
    • https://static.s123-cdn-static.com/uploads/4367313/normal_5feb8afaaf846.pdf
    • https://pafililesenuxag.weebly.com/uploads/1/3/5/9/135964876/e8a6318dd9d9a.pdf
    • https://zibezalobe.weebly.com/uploads/1/3/4/5/134529300/3966746.pdf
    • https://cdn-cms.f-static.net/uploads/4377109/normal_604187ae898d4.pdf
    • https://vomefamatufovo.weebly.com/uploads/1/3/4/3/134378522/6532722.pdf
    • https://lonopowixeza.weebly.com/uploads/1/3/4/6/134620564/ruvusofejun.pdf
    • https://cdn-cms.f-static.net/uploads/4417675/normal_60413ebd34ff3.pdf
    • https://static.s123-cdn-static.com/uploads/4470960/normal_5fcfa2ec7f750.pdf
    • https://cdn-cms.f-static.net/uploads/4375200/normal_60659ebe688d7.pdf
    • https://pojigivawoju.weebly.com/uploads/1/3/5/3/135348152/3d84855ba88d6.pdf
    • https://golisarupu.weebly.com/uploads/1/3/5/3/135317681/7632a6be9611.pdf
    • https://cdn-cms.f-static.net/uploads/4393208/normal_602f36c5c800a.pdf
    • https://cdn-cms.f-static.net/uploads/4479707/normal_6009af1a0e13c.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0ea.bin
7ae4efb47649ff9b214c236afac2ec25a2905104cc0bdb1cbbd0243448d3b97c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0EA 5116 bytes
font_01_sfnt_off00010223.bin
60969be99f7de9992117157fd8c96d08744301307742cd28800261786359ad88		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10223 10664 bytes
font_02_sfnt_off00012628.bin
9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12628 4324 bytes

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