Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9c5682b51fbe6b1…

MALICIOUS

PDF

83.2 KB Created: 2021-04-01 14:37:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3c7f48609f7b11d196280ebe223dbee4 SHA-1: e6c27e6707191d4f1b8d0d5ad289fce2444a40bc SHA-256: e9c5682b51fbe6b1359310db783fae36e665dda76d4708e42f1977ddb89eb1ac
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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
  • 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://lozipotod.ru/aws?utm_term=is+an+air+fryer+good+for+keto+diet
    • https://sasujenag.weebly.com/uploads/1/3/5/3/135337218/sufiduxugivowomor.pdf
    • https://dixudijoketaf.weebly.com/uploads/1/3/4/6/134661748/9816529.pdf
    • http://fajamad.mypressonline.com/famous_architectural_buildings_and_their_architects.pdf
    • https://cdn-cms.f-static.net/uploads/4453551/normal_5fd7bbdc6f53c.pdf
    • https://static.s123-cdn-static.com/uploads/4486206/normal_60044ac225197.pdf
    • https://natitapa.weebly.com/uploads/1/3/1/3/131379406/rejaloxisopegum.pdf
    • https://dawutika.weebly.com/uploads/1/3/1/4/131407504/fivimisabasuregena.pdf
    • https://bimaruzo.weebly.com/uploads/1/3/4/5/134517483/6372916.pdf
    • https://cdn-cms.f-static.net/uploads/4473053/normal_603b6dd39ebb3.pdf
    • https://cdn-cms.f-static.net/uploads/4465392/normal_5fd1decf25ad9.pdf
    • https://cdn-cms.f-static.net/uploads/4454558/normal_6018e28f470dd.pdf
    • https://zobezefifoluza.weebly.com/uploads/1/3/5/3/135306737/lurat.pdf
    • https://gokulibom.weebly.com/uploads/1/3/4/2/134266198/896e48b.pdf
    • https://static.s123-cdn-static.com/uploads/4454184/normal_600607619f1a9.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://sipanokule.onlinewebshop.net/wuxid.pdf
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_87ee06580da441ecadd726cd918540b0.pdf?index=true
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_02b3d0b7a55f477e8550cf3bb5ff4468.pdf?index=true
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_e2dd5e447598461d934933ffd016a71c.pdf?index=true
    • https://e44de090-c64a-4a0f-b555-2784aa0ac37b.filesusr.com/ugd/41d583_562431f094f04f02903c96ffd96a6450.pdf?index=true
    • https://551f0ad2-75d1-4009-b90b-2f3e3e20230b.filesusr.com/ugd/c2bf0a_6a2584bb5a6e4d68afad58526886aa4c.pdf?index=true
    • http://fegoluvarelewum.myartsonline.com/assembler_avec_foxit.pdf
    • 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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eff5.bin
76cc7a15d1fbf4191457787a7093a86a32187936ce1c6f647a10572e514ff685
pdf-font-stream PDF embedded font (sfnt) at offset 0xEFF5 5148 bytes
font_01_sfnt_off00010195.bin
a8c17122953214d16ac3d340e56ecf8351527533c9f68b2d37eef83cb90945e9
pdf-font-stream PDF embedded font (sfnt) at offset 0x10195 11164 bytes
font_02_sfnt_off000127d7.bin
bfa32af85ed9733e9d329932c5444ef017f43cd1cf31216f18da05059aa2c43f
pdf-font-stream PDF embedded font (sfnt) at offset 0x127D7 16632 bytes