Malicious PDF — malware analysis report

Static analysis result for SHA-256 61199f4dc0be2c28…

MALICIOUS

PDF

74.6 KB Created: 2021-03-19 10:09:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e2ccbd9d1ac0c92521acbb3a9795a0a0 SHA-1: ea32b2c0197c83a519a805510162bc30d0e2f5e4 SHA-256: 61199f4dc0be2c2865d11f82d1eddf7bbf05d774bc88826e3af62930bbb6a6f5
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, indicating a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, potentially leveraging embedded JavaScript for exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=guidepost+mystery+books PDF link annotation
    • https://jekewuvewaw.weebly.com/uploads/1/3/1/0/131070420/5294218.pdfIn PDF document text
    • https://cdn.sqhk.co/borefigux/0jeAjfP/kepuxutudirese.pdfIn PDF document text
    • https://mamowolo.weebly.com/uploads/1/3/4/7/134714390/7761203.pdfIn PDF document text
    • https://tigibivimibi.weebly.com/uploads/1/3/4/3/134344299/buwaledu-zokakijas-jevuviwaliw-rigoperuti.pdfIn PDF document text
    • https://cdn.sqhk.co/pasojixaju/idDhdgi/luvubofimaginijulajavi.pdfIn PDF document text
    • https://cdn.sqhk.co/pategazikiw/hgthaIr/nonstop_game_cyber_raid_discord.pdfIn PDF document text
    • https://damapedev.weebly.com/uploads/1/3/4/5/134576203/9397114.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448545/normal_600a530aa431a.pdfIn PDF document text
    • https://cdn.sqhk.co/tasiteregixo/hgbPjbV/lunita.pdfIn PDF document text
    • https://zunuposegilidus.weebly.com/uploads/1/3/2/6/132695990/disaf.pdfIn PDF document text
    • https://kitigenuripoduj.weebly.com/uploads/1/3/1/0/131070171/fataxurugeluf.pdfIn PDF document text
    • http://tuxedefetiju.iblogger.org/graco_click_connect_stroller_winter_cover.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451355/normal_604d1ab3498c4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381748/normal_6008de5e5fa35.pdfIn PDF document text
    • https://sijujufe.weebly.com/uploads/1/3/4/6/134696532/nativebuwakivel.pdfIn PDF document text
    • https://viwezoluzuwa.weebly.com/uploads/1/3/4/4/134401695/jizazijubugerutinasu.pdfIn PDF document text
    • https://siresikewutawin.weebly.com/uploads/1/3/0/7/130739490/8dc29.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c788b29d-df2d-4d46-9946-349e8cce89b7.filesusr.com/ugd/a9e086_867eb65a997c4549820bd4f48c3fe251.pdf?index=trueIn PDF document text
    • https://cceb078e-1df6-42b0-9e12-359f30e42f1d.filesusr.com/ugd/e8506d_0e5805b81b6941d5a9fcd0747eb03b1e.pdf?index=trueIn PDF document text
    • http://gikisomu.epizy.com/annexure_6_form_rrb.pdfIn PDF document text
    • https://a121017b-3fb3-450c-9156-48dd71a9bf80.filesusr.com/ugd/07625c_e251dfdd4d2444a9b03dc8660d8f5335.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_off0000e644.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE644 5200 bytes
SHA-256: 17c6482c2284e0b5d1a98542d730665e2e8d1762551edcdf0032e46762f790e7
font_01_sfnt_off0000f7e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7E5 11076 bytes
SHA-256: 33382a6d7e50d82d2d1515a17d4035572ca3bdbae0a9d0b0ff73f399c6059196