Malicious PDF — malware analysis report

Static analysis result for SHA-256 4add65ccc95ae22a…

MALICIOUS

PDF

76.4 KB Created: 2021-04-08 07:04:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: df79d39841cd0e30e7a32d96f58f2b69 SHA-1: 795441e745317587bf498e9f5e5c1561da409136 SHA-256: 4add65ccc95ae22a3bf0830826a6d5302309ff8b0f10930d32847ad0068d366a
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The embedded URL `https://lozipotod.ru/strik?utm_term=best+way+to+learn+korean+free` and the heuristic `PDF_SEO_LINK_FARM` indicate a focus on driving traffic to external sites. ClamAV detection as `Pdf.Phishing.Trojan` further supports a malicious intent, likely phishing or malware distribution.

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://lozipotod.ru/strik?utm_term=best+way+to+learn+korean+free PDF link annotation
    • https://kilekofizinovi.weebly.com/uploads/1/3/3/9/133997912/gomup.pdfIn PDF document text
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/lulinuv-mulag-zuxevujoluv-kinakofak.pdfIn PDF document text
    • https://sagezawi.weebly.com/uploads/1/3/4/3/134322896/nesunowife.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/iy8hhBz/unicorn_photo_backdrop_diy.pdfIn PDF document text
    • https://gapelovonexi.weebly.com/uploads/1/3/4/3/134385778/riradegatut.pdfIn PDF document text
    • https://cdn.sqhk.co/bilanogakiw/xgejjjh/8511308331.pdfIn PDF document text
    • https://wesobopaforok.weebly.com/uploads/1/3/5/3/135311180/jopasogirirujedupig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/49aa51c5-a2cb-4fbc-80f2-335798688b34/rugewomum.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a58c4abc-7bcf-49cd-8744-7be6cfef2db5/insinkerator_444_3_4_hp_heavy_duty.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a475e5e-6792-4861-8088-f3703db507b2/sipuzofofuremixiwawofifaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a2bfc0-69ad-4260-af39-51287bae5978/how_many_lines_does_banquo_have_in_macbeth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5a28081-ef9c-4881-99ca-90662c0b454a/how_to_thread_a_singer_athena_2009_sewing_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/087df31f-c7b2-43b4-9224-ccc587a487a8/58141467613.pdfIn PDF document text
    • https://4f0f5a39-0a2f-4cdf-b4e4-40a644fad8b9.filesusr.com/ugd/2024fe_f028fae5e2ed4ba98306cb4598532fb5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/eb173541-e5b4-495a-89f2-26c7750d0f6d/how_to_use_shooting_rest_bags.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23c59a59-997e-44ec-9679-348e8e3110ff/zogijokoxojumumamufipiku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e76d6ea-baf3-42d8-99d2-f04a46a20c1e/93356616556.pdfIn PDF document text
    • https://acaa17bf-cf2e-4132-a9e9-810271eb8bc4.filesusr.com/ugd/ab5b4c_95c9904de3ab4537a8b8e5f78e9d8b66.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/da070243-5a03-4334-a7d1-a86ebecf52ed/what_to_call_your_friends_nicknames.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_off0000ec74.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC74 5068 bytes
SHA-256: 06f248f1a8cecb2c30c48df21e1790e261b94afbfa6da7e68ea56f4df2c721c3
font_01_sfnt_off0000fde0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDE0 10912 bytes
SHA-256: 446e7ad68f75ef84a93090b4b5daa0842994547b072bfd3a477da792653fe5f1