Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8dc0f7f9ae1de90…

MALICIOUS

PDF

146.7 KB Created: 2021-03-07 21:13:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cd8eaa8400c32a7c4d8f2e06796a0533 SHA-1: e0cd2444227f6ca44a4f57e866d904984a4350f8 SHA-256: b8dc0f7f9ae1de90173238ea19b5237b8ba21e0e85529b51019a045e3ec31924
126 Risk Score

Malware Insights

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

The PDF was flagged by ML and ClamAV as malicious, indicating it likely serves as a phishing or malware distribution vector. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document contains numerous links to disposable hosting, likely to obscure the final malicious destination. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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://zajinet.ru/aws?utm_term=what+does+a+six+sigma+black+belt+make PDF link annotation
    • https://cdn.sqhk.co/moserusoba/gfhhzji/marvel_stadium_events_manager.pdfIn PDF document text
    • https://cdn.sqhk.co/kepilujofeje/ha0sjbu/biwujerobavuforujobe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428329/normal_600ebc841ca0c.pdfIn PDF document text
    • https://nofodomeki.weebly.com/uploads/1/3/1/8/131871852/kimixatexo.pdfIn PDF document text
    • https://jonozexogu.weebly.com/uploads/1/3/4/3/134357932/7d78d02149af0.pdfIn PDF document text
    • https://kovorugoza.weebly.com/uploads/1/3/1/3/131383314/tewifes.pdfIn PDF document text
    • https://cdn.sqhk.co/pawijilabu/Uiiijbl/19717784100.pdfIn PDF document text
    • https://zitilegog.weebly.com/uploads/1/3/4/5/134501444/2b3ac.pdfIn PDF document text
    • https://cdn.sqhk.co/lunabati/a6MUjea/16629413643.pdfIn PDF document text
    • https://relotevifinedu.weebly.com/uploads/1/3/2/6/132683264/valufidibusiwi.pdfIn PDF document text
    • https://cdn.sqhk.co/jenireni/jdUgcvg/12809736330.pdfIn PDF document text
    • https://gamabisage.weebly.com/uploads/1/3/2/6/132681080/a8c1ade.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410989/normal_5ff29f4726bd5.pdfIn PDF document text
    • https://cdn.sqhk.co/lakisitu/gdYFhc7/dragon_quest_builders_switch_gamestop.pdfIn PDF document text
    • https://cdn.sqhk.co/zasemewiti/Tjrjjib/19002072580.pdfIn PDF document text
    • https://cdn.sqhk.co/wesegagage/kjgjdcT/human_vs_zombies_i_zombie_defense_game.pdfIn PDF document text
    • https://fimiwopagib.weebly.com/uploads/1/3/5/3/135315251/2658202.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368265/normal_5fc7ca112cff2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1618b3f4-dcc0-4047-a816-eeb1cbe43c51.filesusr.com/ugd/a01749_c553e4dfb12a4e27ab393d3968e29b6d.pdf?index=trueIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_0277a84b57ee41ae8fbed9b4bc27609b.pdf?index=trueIn PDF document text
    • https://ffcd7f67-9b43-45c2-8e44-b15cca9583b8.filesusr.com/ugd/48bf55_3db32ea50dd141018603b89660be654c.pdf?index=trueIn PDF document text
    • https://cc968bdf-8a18-4a65-a72d-893c706ef441.filesusr.com/ugd/bae363_633010fbb0f14cfd8c2d22dc9278680f.pdf?index=trueIn PDF document text
    • https://16e729f2-8c5c-4787-b670-14aeba6c5e03.filesusr.com/ugd/ac55e2_93a8720fd75145db977f4e42c248b617.pdf?index=trueIn 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_off0001f9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1F9A7 5540 bytes
SHA-256: 914e763c204b808156339631ef9f13902e2e34d1d5be01f70fa058cbeda1a21d
font_01_sfnt_off00020c6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20C6C 14776 bytes
SHA-256: 298cd5492aa3a868fa5bf072b8247c7d86d6d646629c17ec67e331beb7757853

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