Malicious PDF — malware analysis report

Static analysis result for SHA-256 b435cd2330caeeaa…

MALICIOUS

PDF

97.6 KB Created: 2021-06-09 11:09:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9ce202bb7800c4a5f6ced55c505d8f01 SHA-1: 676875fe9e277038d54eedeba39f38708629d54a SHA-256: b435cd2330caeeaab12881f816fa3dfe33a365b1adfeacc02818784a7d1b5b87
226 Risk Score

Malware Insights

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

This PDF document is classified as malicious and exhibits characteristics of an advance-fee scam, likely attempting to trick users into clicking on external links. The document contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to direct users to potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 7

  • 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
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://pistant.ru/pbw?utm_term=mega+hit+poker+hack
    • https://nebilewanowuz.weebly.com/uploads/1/3/6/0/136083660/baronodufida_muzanaf_vewogunamo.pdf
    • https://guzesunidami.weebly.com/uploads/1/3/0/8/130873942/50380dbaaccf8.pdf
    • https://jonexizuli.weebly.com/uploads/1/3/4/2/134235370/xafifogitusobebigov.pdf
    • https://static.s123-cdn-static.com/uploads/4413475/normal_5ff819490427d.pdf
    • https://fabisinutufonos.weebly.com/uploads/1/3/5/9/135993578/jalebe.pdf
    • https://cdn-cms.f-static.net/uploads/4369654/normal_6033a38352481.pdf
    • https://foxujutuz.weebly.com/uploads/1/3/4/3/134348357/saferuri.pdf
    • https://zifekibovaliw.weebly.com/uploads/1/3/1/8/131871714/dafexaxiviro.pdf
    • https://nuzopilubejam.weebly.com/uploads/1/3/4/4/134459065/devuwukezexalopunege.pdf
    • https://static.s123-cdn-static.com/uploads/4500910/normal_5ff63780f38dc.pdf
    • https://zexerimapepu.weebly.com/uploads/1/3/2/6/132681444/acc9b289da2ff.pdf
    • https://gubelowilesatu.weebly.com/uploads/1/3/0/7/130739845/tipodadubagimudivep.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/eacd184f-72e6-42c9-ac0a-26f5972b82d1/how_to_connect_afterglow_headset_to_ps4.pdf
    • http://masigali.pbworks.com/f/crack_microsoft_office_professional_2016.pdf
    • https://uploads.strikinglycdn.com/files/82bd0821-99f9-4b2c-9c62-6372b19b43ee/fetukaguzij.pdf
    • http://sazupamufode.pbworks.com/w/file/fetch/144936825/vinepezorurofatev.pdf
    • https://uploads.strikinglycdn.com/files/423945c7-e96d-4680-9b90-06afb90bf36f/vibiv.pdf
    • http://botinuba.pbworks.com/w/file/fetch/144607941/27686472305.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fda9.bin
4c688c0676da4c9c3f1d636d29496b85ed1f90b4285ee9b780884cc7de0e34ac
pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA9 2960 bytes
font_01_sfnt_off00010819.bin
58b4b1b1405ede268331256315bcc0921d70b85ecc9e2295d7f4e7fb7756d228
pdf-font-stream PDF embedded font (sfnt) at offset 0x10819 4736 bytes
font_02_sfnt_off00011846.bin
cc9f0e78816ee64aeebc9642652844ecd36eeda6f12d8a9f4dd9c71469319e08
pdf-font-stream PDF embedded font (sfnt) at offset 0x11846 3312 bytes
font_03_sfnt_off000125cf.bin
81b4b4776501731d718cbf3f1242b4868bf3daff7de337fda9d46bf036608875
pdf-font-stream PDF embedded font (sfnt) at offset 0x125CF 12380 bytes
font_04_sfnt_off0001502b.bin
1e28272c4d79ec32dde66765a104d2dbfc910a1e9f7dd661d3a8abf6f3df0f77
pdf-font-stream PDF embedded font (sfnt) at offset 0x1502B 17832 bytes
font_05_sfnt_off000169c3.bin
cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34
pdf-font-stream PDF embedded font (sfnt) at offset 0x169C3 4324 bytes