Malicious PDF — malware analysis report

Static analysis result for SHA-256 7473ae83169a74d4…

MALICIOUS

PDF

75.0 KB Created: 2021-06-03 09:23:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: f370c39de30d65f5016e5c8f8c79760d SHA-1: 58af5875e24973f79a9d03e58a6091411261c95c SHA-256: 7473ae83169a74d418ebfdcd08f04c7a481d620706d72241d422525c833e68a0
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 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://krisoc.ru/pbw?utm_term=how+to+write+a+business+email+asking+for+information PDF link annotation
    • https://koreperuk.weebly.com/uploads/1/3/2/6/132680900/tuwerudabobav_gufoxeji_goguwigofevesa_koxejivixenolu.pdfIn PDF document text
    • https://nowoboxemubo.weebly.com/uploads/1/3/4/8/134893539/6610707.pdfIn PDF document text
    • https://rogetaguw.weebly.com/uploads/1/3/1/4/131407632/1295592.pdfIn PDF document text
    • https://pabenegoje.weebly.com/uploads/1/3/4/3/134348732/028ce157d38b73d.pdfIn PDF document text
    • https://luwidejike.weebly.com/uploads/1/3/4/8/134881341/masoxeb.pdfIn PDF document text
    • https://rujogapojepon.weebly.com/uploads/1/3/4/5/134597846/ruxujid.pdfIn PDF document text
    • https://lenatazuponos.weebly.com/uploads/1/3/4/8/134888684/1098958.pdfIn PDF document text
    • https://gakulenem.weebly.com/uploads/1/3/1/4/131437742/45e9eafc45d.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/motowaruzu_mosemivolat_rilelu.pdfIn PDF document text
    • https://werobipopopavuv.weebly.com/uploads/1/3/1/1/131163729/385232.pdfIn PDF document text
    • https://filuwanukolo.weebly.com/uploads/1/3/4/8/134874182/9777280.pdfIn PDF document text
    • https://wezifujizofuji.weebly.com/uploads/1/3/4/9/134904593/nomuxuluwa.pdfIn PDF document text
    • https://vegivuben.weebly.com/uploads/1/3/4/6/134660922/geloje.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mevuteled.pbworks.com/f/72319066034.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9f298aa-2744-4170-aac4-2defed9ad38c/how_to_remove_a_vivint_doorbell_camera.pdfIn PDF document text
    • http://farejutotej.pbworks.com/w/file/fetch/144533679/jegafegi.pdfIn PDF document text
    • http://lijegazoz.pbworks.com/w/file/fetch/144414087/diary_of_a_street_diva_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03189016-b4dd-4e04-a22a-626ed31dc9ec/al-quran_al-karim_the_noble_quran_a5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02e3bd15-aeed-4f48-8d60-efade98e0dc6/plan_a_meal_plan_beachbody.pdfIn PDF document text
    • http://kapetipubi.pbworks.com/w/file/fetch/144425955/alif_laila_sindbad_episode_19.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21dee470-f14a-4444-b694-36d0806add24/fender_mustang_1_v2_guitar_amp.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_off0000e889.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE889 5344 bytes
SHA-256: bdda014563fb86725e0b9f5ce3a4523d30834ed4e06cfb96a4650c17dfd2e6bc
font_01_sfnt_off0000fab2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAB2 10308 bytes
SHA-256: bc50a43e2b6cb2be50873d9dc9fdbef37cc693050464cf68f038d52250bed167