Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fa2173d4f7308e8…

MALICIOUS

PDF

85.8 KB Created: 2021-04-25 19:54:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 89f1ba6755e35cc9f7df03cb05517754 SHA-1: 71138be51f96031a32f48905ea2f130c6867b1ab SHA-256: 4fa2173d4f7308e8ccc7fbd2f76e93f61489f032729caf09583fc5279acff8b1
186 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as a link farm and a phishing/malicious PDF. It contains numerous external URLs, many pointing to disposable hosting or redirectors, suggesting an attempt to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/strik?utm_term=riptide+ukulele+strumming+pattern+easy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465907/normal_6047fdac2262b.pdfIn PDF document text
    • https://lomewulepizava.weebly.com/uploads/1/3/3/9/133999744/noduzozerawugosan.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/Wg6pHjj/chspsc_settlement_com_claim_form.pdfIn PDF document text
    • https://zugozoriv.weebly.com/uploads/1/3/4/7/134770463/e3e94aa8701ab72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485821/normal_5fcd72e39d401.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485696/normal_60059852c1d52.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426815/normal_5fd04b40da967.pdfIn PDF document text
    • https://mologikonazo.weebly.com/uploads/1/3/4/7/134706863/gevavapivujakavosu.pdfIn PDF document text
    • https://piborubaladedos.weebly.com/uploads/1/3/4/7/134764427/xaxude_zesanagalivurex.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408184/normal_5fe8e7ee2bd3e.pdfIn PDF document text
    • https://rawekawus.weebly.com/uploads/1/3/4/4/134467784/ditosolos.pdfIn PDF document text
    • https://cdn.sqhk.co/geruxibab/jjHYhhd/63794458771.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/ea630420-c88e-46f8-9aee-280146eef3dc/nozugokiverawe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f9bb8a-b26a-44d3-aa83-08e674eb1fba/where_are_krups_toasters_manufactured.pdfIn PDF document text
    • https://ab25a8b3-4d80-4d4b-93a1-c1347014fa7c.filesusr.com/ugd/8d0191_a17ed6eaaf6a4c22840586cd8307179d.pdf?index=trueIn PDF document text
    • https://03df18d0-0a94-4077-8b44-1f3cf8b7c870.filesusr.com/ugd/23a6c3_bbc59731b7194bceb1984c051abed73c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/56a83bba-909f-491b-957d-5563db0b3e44/5125734570.pdfIn PDF document text
    • https://s3.amazonaws.com/veraxawewib/fraction_word_problems_worksheets_5th_grade.pdfIn PDF document text
    • https://d71fc03c-aea6-48f7-a990-8afffb22108d.filesusr.com/ugd/3de8a6_1bfa33d73c8b4f7b93ebd507075d57b0.pdf?index=trueIn PDF document text
    • https://2ea3657d-1c4c-40dd-8491-58aeeb8dc933.filesusr.com/ugd/18a85a_f0722896f4f94c54ac457b147b430f10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/libosokune/lifebimukunuraxal.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_off00010d53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D53 5452 bytes
SHA-256: 744b0c3d776ec066161bdd335de9b76606cbf54cbde0c19656e0eae6410dcbbf
font_01_sfnt_off00011fd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD4 11792 bytes
SHA-256: ba6b8780070b2447e944c2300cb75b1d52f409b1a6062488e88ccd9e4ce56805