Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9a750c5d70c90d4…

MALICIOUS

PDF

82.2 KB Created: 2021-05-25 00:26:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 568e1cff6c73af288158cdef760e7ce5 SHA-1: d7f61d9a27b28e7050bfc07878fbe93c1df21d63 SHA-256: e9a750c5d70c90d40ced7cb6f1aaa0d11174411e1621f65c7b5bb48411e9d41d
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which point to SEO-optimized content farms, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to malicious websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://gimoguvi.ru/strik?utm_term=los+mejores+libros+pdf+para+aprender+italiano
    • https://cdn-cms.f-static.net/uploads/4471959/normal_603da6ba1d9c5.pdf
    • https://cdn-cms.f-static.net/uploads/4389358/normal_605cbea759b09.pdf
    • https://zufajutikeg.weebly.com/uploads/1/3/4/3/134355725/joxebuxibogajoguni.pdf
    • https://wovugozota.weebly.com/uploads/1/3/2/6/132695813/8704311.pdf
    • https://xisovunegukizak.weebly.com/uploads/1/3/4/8/134868464/03737e8c1.pdf
    • https://static.s123-cdn-static.com/uploads/4487432/normal_5fcd55da9275a.pdf
    • https://cdn-cms.f-static.net/uploads/4485446/normal_605d93499c9c7.pdf
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/jibowusavokese_melomapedu.pdf
    • https://riwinimogo.weebly.com/uploads/1/3/0/9/130969841/zugoxinakuse.pdf
    • https://zuranuwazob.weebly.com/uploads/1/3/5/3/135332575/1386192.pdf
    • https://cdn-cms.f-static.net/uploads/4463830/normal_5fe7d52a3930d.pdf
    • https://bidopafogusiw.weebly.com/uploads/1/3/1/0/131070115/7495560.pdf
    • https://cdn-cms.f-static.net/uploads/4381082/normal_603ea9bf95316.pdf
    • https://wojaxesisitofem.weebly.com/uploads/1/3/4/7/134717171/367031.pdf
    • https://tabefelob.weebly.com/uploads/1/3/4/3/134372343/kotodimorem_wadomoz_jimoxafezojunu_xizowuguluk.pdf
    • https://dofazodasi.weebly.com/uploads/1/3/0/8/130873943/doginazez-diwuki-tixuzobir.pdf
    • https://tenasedoba.weebly.com/uploads/1/3/4/3/134333827/8432579.pdf
    • https://binimejo.weebly.com/uploads/1/3/4/6/134665204/seburujifepaxe_ruladoj_lilenutar.pdf
    • https://cdn-cms.f-static.net/uploads/4420612/normal_5fe968643edba.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/gedesisumi/how_to_replace_aprilaire_600_humidifier_filter.pdf
    • https://s3.amazonaws.com/zerejibixupav/81978447751.pdf
    • https://s3.amazonaws.com/jefazaxal/13978569124.pdf
    • https://s3.amazonaws.com/lotibabakuj/video_evanescence_my_immortal_live.pdf
    • https://s3.amazonaws.com/tujeviwakirawu/discussion_guide_before_we_were_yours.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_off00010063.bin
317b36f23f98bfb6ea65ecb16f5073e913f0b5b5608b7e3bd263bc7cdf2176de		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10063 5344 bytes
font_01_sfnt_off00011271.bin
c1433143815e325e755ccc2073c5519bcfef4d3d1ed43a750049ac12dc245117		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11271 12168 bytes

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