Malicious PDF — malware analysis report

Static analysis result for SHA-256 a2715a1bfa399193…

MALICIOUS

PDF

81.3 KB Created: 2021-03-18 13:39:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: f4a046fabca964f046f2c7c825ac9214 SHA-1: 2445e68a9d804f7d3fcf37c5fe2a0e95da6b2c96 SHA-256: a2715a1bfa399193a62eb4a2c20907eb7204371d8b2863bb56a9cfaf2cc8f54a
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, many hosted on disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or scamming. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to lead users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://lozipotod.ru/123?utm_term=cancer+gastrico+difuso+pdf PDF link annotation
    • https://cdn.sqhk.co/zeboxuze/icZcmM9/degokojiwemofetirofusa.pdfIn PDF document text
    • https://tadonajates.weebly.com/uploads/1/3/4/3/134319020/9275932.pdfIn PDF document text
    • https://kivijakesav.weebly.com/uploads/1/3/2/7/132740669/91d95.pdfIn PDF document text
    • https://narapafugoziror.weebly.com/uploads/1/3/0/7/130775848/4467390.pdfIn PDF document text
    • https://sagupegijugix.weebly.com/uploads/1/3/4/4/134443219/bujuretis.pdfIn PDF document text
    • https://balolenitazir.weebly.com/uploads/1/3/1/0/131071159/4217033.pdfIn PDF document text
    • https://xataramev.weebly.com/uploads/1/3/4/3/134320843/1c753bd.pdfIn PDF document text
    • https://jawoxufogor.weebly.com/uploads/1/3/6/0/136022219/numopoxi.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/solid_waste_management_for_competitive_exams.pdfIn PDF document text
    • https://wofiwajelakezod.weebly.com/uploads/1/3/6/0/136092853/4456793.pdfIn PDF document text
    • https://cdn.sqhk.co/kovutego/WohgiOb/kakad_aarti_lyrics.pdfIn PDF document text
    • https://dujizajep.weebly.com/uploads/1/3/4/7/134704211/wexamulejisixe.pdfIn PDF document text
    • http://lobabinuladeri.medianewsonline.com/how_to_setup_scan_on_hp_officejet_4630.pdfIn PDF document text
    • http://bebetadiruj.mywebcommunity.org/dd_3.5_classes.pdfIn PDF document text
    • https://poriveba.weebly.com/uploads/1/3/4/3/134316211/2618127.pdfIn PDF document text
    • https://pewatusikowago.weebly.com/uploads/1/3/2/6/132683224/xovemido_xiraxefawex_zuxafemol_vemugi.pdfIn PDF document text
    • https://vefenebef.weebly.com/uploads/1/3/4/8/134885139/laleni.pdfIn PDF document text
    • https://nokifijipuf.weebly.com/uploads/1/3/4/3/134305843/82af977.pdfIn PDF document text
    • https://jexafowasefuxuv.weebly.com/uploads/1/3/4/5/134588667/nikokezubejosetubexa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://79d86aa2-23c4-4aa0-a0dc-c16ac59ae55d.filesusr.com/ugd/ecb701_1bf540a3192d4c96b7de98f6d10764d0.pdf?index=trueIn PDF document text
    • https://8eb0ff2f-1b5f-41fb-a82b-bf279dc7f43e.filesusr.com/ugd/868f76_a1558aff10cf4192ac9dc92bed737777.pdf?index=trueIn PDF document text
    • https://8d5bcf17-53f2-4f21-b585-7a27aef14131.filesusr.com/ugd/7baf93_be0d1b4690454f76a0a385c7a1885bbf.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e674.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE674 5196 bytes
SHA-256: fa82bfc0c5c1709844a0a2e84b45457640ea457050adb6ce0892ad8ce3168b9c
font_01_sfnt_off0000f82e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82E 12432 bytes
SHA-256: 23480b2387248f3a4bad1ab83a89d25fd0fac2cfc1c2e60f429a8e1a058a1658
font_02_sfnt_off000120c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120C5 16204 bytes
SHA-256: a95eff378c135b1ab40d10b3cd1da1bafbc07f86005f57898d079c90d712ddbd