Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ce03bb13ea99604…

MALICIOUS

PDF

79.0 KB Created: 2021-04-05 03:10:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0cfc6e29b223028024da352051a6938e SHA-1: de915d8db1cedfe28dae51ad40a190442b80beea SHA-256: 0ce03bb13ea996045a167e71d254babb4a48771ceccf811e99ed318b6dc5ad1f
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://mezovuduw.ru/wix?keyword=once+upon+a+time+nadine+gordimer+audio PDF link annotation
    • http://pinopizo.sportsontheweb.net/46657527116.pdfIn PDF document text
    • http://larekew.mywebcommunity.org/teaching_approaches_in_music_theory.pdfIn PDF document text
    • http://trafikcezaodebayisi.com/gevalavuvizosifoxojajlseu.pdfIn PDF document text
    • http://vujenixuwo.mypressonline.com/search_site_for.pdfIn PDF document text
    • https://cdn.sqhk.co/fevivesuxofo/herKifd/best_ant_killer_gel_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/jb3jegH/telegram_definition_ww1.pdfIn PDF document text
    • http://gufutaca5.xyz/pufifoxejopowiwedefojipiax7nr.pdfIn PDF document text
    • http://dayzcommunity.info/format_allocation_unit_size_meaningjwa7l.pdfIn PDF document text
    • http://biniwitovo.mywebcommunity.org/satidifotorifovuxovubu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ab2ac9d4-4772-4872-829d-c19fde0a4f90.filesusr.com/ugd/b919b3_b8cb5ca321d54dc997a995f36d817a88.pdf?index=trueIn PDF document text
    • https://4edd92ed-4e96-4c3d-a837-a16c7246ae9e.filesusr.com/ugd/7c3149_93f5bb790fe34fb38f1498530a7ffc3a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mudurixo/11709313025.pdfIn PDF document text
    • http://zagofij.onlinewebshop.net/17044361187.pdfIn PDF document text
    • https://s3.amazonaws.com/jeduzizonox/95301555376.pdfIn PDF document text
    • https://76bf09fe-c378-4d6f-baa9-beaf48595a8b.filesusr.com/ugd/61567a_9fcd8162cf8c4f31ae0f800029269a74.pdf?index=trueIn PDF document text
    • https://7ed754b6-a209-4558-9281-0032c7ee8ade.filesusr.com/ugd/4329d7_b8be9481fedf44b49b62024bcc800161.pdf?index=trueIn PDF document text
    • https://ce419959-236d-4487-89d7-67f356bda573.filesusr.com/ugd/147b51_5abc6b3f80d94202b7ff18596cad29b6.pdf?index=trueIn PDF document text
    • https://9cc02d22-446e-415d-9686-6e49aadcb3b3.filesusr.com/ugd/aa6a08_a0f82f56282d47b0922a64a0b775dc50.pdf?index=trueIn PDF document text
    • https://d0fd22f1-78bd-4368-960d-2a324028b2bb.filesusr.com/ugd/a4d998_9a1a9945c47840b5b6147e18e7007641.pdf?index=trueIn 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_off0000f678.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF678 5208 bytes
SHA-256: 7f251e0d420f6411a6c2691c9379954854c32fcbc00873b0447038e11c0bd235
font_01_sfnt_off00010818.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10818 11528 bytes
SHA-256: 2846a6a700ce1a125b13383aac28d4bfd3021d48706e854f851b9feed913b314

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