Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f725c115b4635af…

MALICIOUS

PDF

108.9 KB Created: 2021-03-29 20:44:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4b5cf92eb39647c7aace12b29626ea86 SHA-1: 56979e21fd7c18ebfe4c317d0d6e73c0411a6a89 SHA-256: 2f725c115b4635af34c6bd3efcef6e51da9033e0d60df6eb961b18c1ee8e9c7f
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm. It contains numerous embedded URLs, with a primary external URI pointing to 'https://gimoguvi.ru/strik?utm_term=revised+extended+standard+theory+pdf'. This suggests the PDF is designed to redirect users to potentially harmful content, likely for phishing or further malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://gimoguvi.ru/strik?utm_term=revised+extended+standard+theory+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4419433/normal_603e9b6b10fc0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367013/normal_5fc6149b2afe2.pdfIn PDF document text
    • http://zetomanebegox.iblogger.org/44367081383.pdfIn PDF document text
    • http://firejowetawo.iblogger.org/zetumosofodez.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389823/normal_6053261b12873.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449000/normal_5fe95229ae076.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4472793/normal_5fe17f28b49a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391623/normal_6058ae7a8ba23.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483842/normal_6036682a1dd8a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421036/normal_603765bea981e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5fea3c3b3b0c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496585/normal_601eac43ad73a.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/ghtGhfO/turbo_dismount_on_y8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383679/normal_601134d56d91d.pdfIn PDF document text
    • https://cdn.sqhk.co/tixuniwe/Gjjibu7/rope_hero_frog_ninja_apk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491148/normal_5fccab6e4054f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://biwaborobow.rf.gd/10969495163.pdfIn PDF document text
    • http://kifofok.epizy.com/zujidutakevozumupedej.pdfIn PDF document text
    • http://peburameg.epizy.com/avakin_life_hack_apk_ios.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000117a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117A8 26640 bytes
SHA-256: d211e07bdcb284187abf814f40532d61cc39b9a5740a076fee8fcbe11400e1a1
font_01_sfnt_off00016a2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16A2A 5336 bytes
SHA-256: 5af4de7e31978be3540fe6a2eced0fb506cf6591f630e17512d19f82153602a4
font_02_sfnt_off00017c5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17C5B 12132 bytes
SHA-256: dd54311f2e343da65cbb5872b28848a18d435fb17ad599ffd37f9e7a61df6b1c

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