Malicious PDF — malware analysis report

Static analysis result for SHA-256 64af5ea5f073761b…

MALICIOUS

PDF

79.2 KB Created: 2021-03-22 20:05:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7456291a98b0863b71f85172e3a1ed1c SHA-1: 6e007f3a1c2d6d8d03f1357e5be982907e403332 SHA-256: 64af5ea5f073761b850e710e59c66af1b3b2faa1fecebf5fe78d700a04fe425a
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The presence of embedded URLs and the PDF structure suggest it is designed to redirect users to potentially malicious content hosted on external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/123?utm_term=skies+of+arcadia+ost
    • http://cetapp.xyz/232929919t6j5v.pdf
    • https://cdn-cms.f-static.net/uploads/4483591/normal_600a65b4e3978.pdf
    • https://cdn-cms.f-static.net/uploads/4373987/normal_6031feb129b88.pdf
    • https://static.s123-cdn-static.com/uploads/4445726/normal_5fc9463eacc0a.pdf
    • http://sodaapp.pro/how_to_destroy_old_medical_recordslw9il.pdf
    • https://jesasifewom.weebly.com/uploads/1/3/1/4/131453969/c09c868e.pdf
    • https://cdn-cms.f-static.net/uploads/4451755/normal_6022c6e2930d3.pdf
    • http://xivitej.66ghz.com/vba_vlookup_multiple_sheets.pdf
    • https://pedidifapa.weebly.com/uploads/1/3/0/8/130874671/7215a99f6f.pdf
    • https://tepidupelagoxu.weebly.com/uploads/1/3/4/4/134472529/674049.pdf
    • http://pink-echo.club/21831814010p58ut.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://ad0d0dbb-669b-46a9-85df-79487014a0f3.filesusr.com/ugd/00d95d_7fe3167ca673468493d16646ea5787a6.pdf?index=true
    • https://f4b9ed98-44c1-44e6-9966-d9817cd43de7.filesusr.com/ugd/9ced5d_6c7bcf749ae34c42a6019c0421004ab6.pdf?index=true
    • https://351e5f87-f9e5-4015-92cd-d601692b9ec3.filesusr.com/ugd/a0d0d3_e7874bec8d1c4f49a7bbc52e60b8e25c.pdf?index=true
    • https://a39ac558-8fe8-437d-9e10-dc9402d6cb9c.filesusr.com/ugd/1ebe14_771e915c40734355bde13380ede2bd10.pdf?index=true
    • https://s3.amazonaws.com/silubebebefuju/creating_word_templates_2013.pdf
    • https://s3.amazonaws.com/xomepixo/67690613632.pdf
    • http://fuvituze.epizy.com/epcrs_catalogue.pdf
    • https://s3.amazonaws.com/jipowumat/fijedidubixuk.pdf
    • https://2080fafa-2491-4ac3-8118-a138f33bff34.filesusr.com/ugd/822ecd_6fe7872c7aa443b98bb83c8bb2c3a9cf.pdf?index=true
    • http://bepinutarefe.rf.gd/pekinazunulawitusuv.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_off0000f748.bin
f92eaba18c10ad432d5f7dc4365ac099699ffcbefdd98b44f32fa0731311aff9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF748 5148 bytes
font_01_sfnt_off000108dd.bin
5be325f19f87c5b92d4fd51b5bdd30fd66d64fc2bda733447a084e657734b690		 pdf-font-stream PDF embedded font (sfnt) at offset 0x108DD 10976 bytes

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