Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe2335f6c03ba58…

MALICIOUS

PDF

70.9 KB Created: 2021-03-11 12:33:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: c6b61d642ea06f14a55faee5c596c6e4 SHA-1: ba880014b8edb2ecdca7771c5a05e2b42548d280 SHA-256: 6fe2335f6c03ba58fd321d371df5f86a790a550b28af683d7c9616265b382a3c
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV both flagged this file as malicious, with ClamAV identifying it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and numerous external URIs indicate an attempt to redirect users to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/123?utm_term=charlie+malayalam+chundari+penne+song PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475216/normal_60450bd220e89.pdfIn PDF document text
    • https://pojuzalik.weebly.com/uploads/1/3/4/2/134235388/gozagupuwok.pdfIn PDF document text
    • http://nowexevor.iblogger.org/20937438324.pdfIn PDF document text
    • https://cdn.sqhk.co/nukusigemug/FgcHJif/legananokopizuzuxadowok.pdfIn PDF document text
    • https://rojukekodeb.weebly.com/uploads/1/3/4/6/134682316/9866209.pdfIn PDF document text
    • https://tewizoduwab.weebly.com/uploads/1/3/5/3/135341898/borezinofale.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411490/normal_601535667fad5.pdfIn PDF document text
    • https://zowukudikumo.weebly.com/uploads/1/3/1/3/131382828/xanobud.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413566/normal_5fc998aad45e6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385014/normal_60445ab555074.pdfIn PDF document text
    • https://cdn.sqhk.co/kululojilo/yfUKgfF/2pac_changes_text_deutsch.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488804/normal_6045143897d17.pdfIn PDF document text
    • https://pozivikebesar.weebly.com/uploads/1/3/4/7/134759309/8532185.pdfIn PDF document text
    • https://cdn.sqhk.co/miwurazaz/vgghK7N/fancy_name_generator_free_fire.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446931/normal_604647b7e8f7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377704/normal_6020f91ecdf72.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tufuripisaren.epizy.com/centimeters_meters_kilometers_worksheet.pdfIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_409956e127b8402080a10eb34173bd8d.pdf?index=trueIn PDF document text
    • http://rasukadixekurij.rf.gd/sri_ranganathar_photos.pdfIn PDF document text
    • https://901c4554-6fda-40bf-8344-1f1538f5dc06.filesusr.com/ugd/a76634_71a5ee1cb83c4bb5a43ca623e8a8b47d.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_off0000d791.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD791 5496 bytes
SHA-256: 959a5cb3337055cfe39ec729ee78f356e415b801cbf45e96dc232325f46667a2
font_01_sfnt_off0000ea13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA13 10660 bytes
SHA-256: 2927420ed2c331985a235681716a253efe78237fa7c8740b118334fa52a8c62f

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