Malicious PDF — malware analysis report

Static analysis result for SHA-256 b328e37722f46bda…

MALICIOUS

PDF

76.3 KB Created: 2021-02-20 13:24:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: a21c9f21615b20558908a0b2dd832165 SHA-1: 3db8236042ad96a6d4ff6fa58d927bd13f72857c SHA-256: b328e37722f46bdad469e65bf852f90680f38bd01c19af93cabde77285915e8c
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://leonvi.ru/123?utm_term=john+deere+l110+lawn+mower+deck+belt PDF link annotation
    • https://riwinimogo.weebly.com/uploads/1/3/0/9/130969841/mojodesarize_dupetiriviwij_xazode.pdfIn PDF document text
    • https://betirowi.weebly.com/uploads/1/3/4/6/134661799/sevovidorelen.pdfIn PDF document text
    • https://cdn.sqhk.co/bewewojiwo/TUidShe/live_wallpapers_for_iphone_11_pro_max.pdfIn PDF document text
    • https://susejovidexoxi.weebly.com/uploads/1/3/0/7/130775922/2395f05b811.pdfIn PDF document text
    • https://dotuxebi.weebly.com/uploads/1/3/1/4/131454754/259b0.pdfIn PDF document text
    • https://natatujefeni.weebly.com/uploads/1/3/1/6/131607075/wetuxabatatodijeva.pdfIn PDF document text
    • https://cdn.sqhk.co/tinupolureg/bgjvHQP/sitowixefegesikilux.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://woloripovopakop.rf.gd/27402805727.pdfIn PDF document text
    • http://gemakeruw.epizy.com/68602478548.pdfIn PDF document text
    • http://fewetero.epizy.com/bozubazopoxanubiw.pdfIn PDF document text
    • https://s3.amazonaws.com/jewizopukuni/feluzavebame.pdfIn PDF document text
    • https://s3.amazonaws.com/gofilafixu/xasojonoxovixanovi.pdfIn PDF document text
    • http://kopozeluzel.epizy.com/divusugiverojiton.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/rupinder_gandhi_new_song_jigri_yaar.pdfIn PDF document text
    • http://jadupapobixe.epizy.com/tosagometuxafirifajezolu.pdfIn PDF document text
    • http://lawubipala.epizy.com/motorola_walkie_talkie_user_guide.pdfIn PDF document text
    • http://bodotekufuw.rf.gd/7223935783.pdfIn 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_off0000ec61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC61 5480 bytes
SHA-256: 8274cede667fb28d845ea2b13babcca584427e9dfb058383484ddc9aae757435
font_01_sfnt_off0000feec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEEC 10996 bytes
SHA-256: a896ce337eacd50fd21c6ffd3d4e57fa30e9148ac71d915e70951d218ca491fd

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