Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7103059161e6ea3…

MALICIOUS

PDF

73.6 KB Created: 2021-05-16 15:19:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4258b309db04fa336d6b6e2fd148f0c5 SHA-1: ebfaada110ea0fbc7eb7982a8ed1ae0813a61e20 SHA-256: d7103059161e6ea3a23a7380f06b93629afbd9d4b37e5e39108545beee66c59d
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://vilenefex.ru/strik?utm_term=why+animal+sacrifice+in+old+testament
    • http://wepijafiguwenan.mywebcommunity.org/acer_aspire_one_d255e_manual.pdf
    • https://giligigava.weebly.com/uploads/1/3/4/4/134494785/d20524.pdf
    • https://zoredufuno.weebly.com/uploads/1/3/4/6/134638801/7013281.pdf
    • https://menesifewo.weebly.com/uploads/1/3/0/8/130814293/5769c.pdf
    • https://mafupalitofix.weebly.com/uploads/1/3/4/0/134042392/nuvaw.pdf
    • https://padipemoton.weebly.com/uploads/1/3/0/7/130739419/dc517a4326ad4a8.pdf
    • https://tudogaxutu.weebly.com/uploads/1/3/5/2/135295125/301392.pdf
    • http://pelinebaj.mypressonline.com/1948164069.pdf
    • http://wobafobigo.mywebcommunity.org/how_to_put_legs_on_element_tv.pdf
    • http://delinapod.mypressonline.com/refitudajuzuzeri.pdf
    • http://nutetuxiv.mygamesonline.org/ecology_and_environment_textbook.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://wobadumiravolu.atwebpages.com/similarities_between_verbal_and_non_verbal_communication.pdf
    • http://fikamax.epizy.com/nolanivokulikezoxatovup.pdf
    • http://kutugujipix.epizy.com/burning_spear_christopher_columbus_audio.pdf
    • https://2cc935b2-b854-4d3d-8499-e3bac5ec7384.filesusr.com/ugd/2e82fc_618d95da88bc4e0b8015998d4f3c4219.pdf?index=true
    • http://somasetowijo.myartsonline.com/bipazalewekatelatetitigib.pdf
    • http://bimogafokusifav.epizy.com/rearrange_pages_acrobat_dc.pdf
    • https://e6343aec-df69-40e7-9959-3c0c55bf73c9.filesusr.com/ugd/6a9017_9da82d71078b494fa885dd11f23ea6a9.pdf?index=true
    • http://nupabumafe.epizy.com/82641406861.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b3.bin
2bfd2a7ec6a6f22c4c0ab9e3deaa94104a90f70a15a96093b29b394b0bbabeab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B3 5376 bytes
font_01_sfnt_off0000f3e7.bin
9dd0d4492f777407d87a58cfd6852f770f37cd8bcdc658b2b2770e87f192c3c6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF3E7 10480 bytes

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