Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6dc024525d25089…

MALICIOUS

PDF

79.8 KB Created: 2021-03-19 14:18:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: 2c285e65b3eddbff73b7d6a17f3adede SHA-1: 51b7e051bb57ba324450fd49931550cb268c0f4f SHA-256: d6dc024525d25089cea54e86c007a0a82d4c29e37237410588c8a8f4405a3ac6
226 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1539 Steal or Forge Credentials T1059.007 JavaScript

This PDF document was flagged by multiple heuristics, including ML classification and ClamAV, as malicious phishing content. The document body, though heavily obfuscated, combined with the 'SE_MFA_LURE' heuristic, indicates an attempt to harvest credentials or session tokens by impersonating a security verification process. The numerous external URLs suggest a link farm designed to redirect victims to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • MFA / one-time-code harvesting lure high SE_MFA_LURE
    Document asks for a one-time code, authenticator approval, or MFA confirmation — consistent with credential phishing kits that steal session tokens or abuse multi-factor authentication
  • 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/wix?keyword=ap+human+geography+exam+study+guide+quizlet PDF link annotation
    • http://serovakarara.mygamesonline.org/9750795948.pdfIn PDF document text
    • https://vubisurajoguv.weebly.com/uploads/1/3/4/2/134265568/kadilivumoferef-magapakemafobe-vomigurudezena-telugemajopexi.pdfIn PDF document text
    • https://vuderuxedus.weebly.com/uploads/1/3/4/6/134692959/d837ba9.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/njgjaAQ/carx_highway_racing_hack_online.pdfIn PDF document text
    • http://ch-redirect.icu/In PDF document text
    • https://cdn.sqhk.co/govazofaj/Dhe4id1/simulife_life_simulator_games_pc.pdfIn PDF document text
    • https://wamebadafexu.weebly.com/uploads/1/3/4/0/134040762/3746858.pdfIn PDF document text
    • https://cdn.sqhk.co/mibemofega/iihiQri/22091799608.pdfIn PDF document text
    • http://purpless.vip/gisixojowogarax3kx1e.pdfIn PDF document text
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/revinesikis.pdfIn PDF document text
    • https://cdn.sqhk.co/mumaxifup/3ggggw7/xejufumomadudukinelut.pdfIn PDF document text
    • http://sneakerspapa.store/vogobogedekuxilizp22.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_69d2a12a7f2d45468c9e14370992ac74.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muvevanepen/dofuvuleni.pdfIn PDF document text
    • https://484a0fbd-04e0-416f-b335-41eb3f66808b.filesusr.com/ugd/228afb_dee71ffd72ba45dcad7663931516c9ea.pdf?index=trueIn PDF document text
    • https://780c8f77-0f51-49ab-8dd1-60a90eb210a4.filesusr.com/ugd/1b8612_09d97da55cec45e28eba47d4db2e353e.pdf?index=trueIn PDF document text
    • https://c3438639-6a75-4920-aa4f-d1e0b619354f.filesusr.com/ugd/3be3a7_6ade04cc7b774c8486bb2d228bcb933e.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pobixedele/ruffles_bexley_size_guide.pdfIn PDF document text
    • http://fararisujis.myartsonline.com/mental_retardation_treatment.pdfIn PDF document text
    • https://s3.amazonaws.com/bajuse/pudane.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_off0000fad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD9 5708 bytes
SHA-256: 45dc73896a3cbee64035ab6adb475f03ee2df570b72ba976e6222dc5ed682bd9
font_01_sfnt_off00010e2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E2A 10544 bytes
SHA-256: dad9d9efaba50345edc56f9535d9b180ff734dbcf607373e9e139fa65dcf369a