Malicious PDF — malware analysis report

Static analysis result for SHA-256 45f9c50ec5cda9fe…

MALICIOUS

PDF

79.1 KB Created: 2021-03-21 07:08:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e060b671a32394a7383be1a4d758b3b4 SHA-1: 7cbcdeaf2d248062526a0dfad0cc19947ba7ed13 SHA-256: 45f9c50ec5cda9fe9fa309c6218c344a8b9762bcb5badc319f494b45675d1119
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms or phishing campaigns. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external PDF links, and the 'CLAMAV_DETECTION' confirms it is classified as a phishing trojan. While no scripts were directly extracted, the presence of embedded URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious or deceptive websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://zajinet.ru/award?keyword=area+compound+shapes+worksheet+answer+key+pdf
    • https://cdn-cms.f-static.net/uploads/4486772/normal_5fd7f6b0a6f79.pdf
    • https://cdn-cms.f-static.net/uploads/4419836/normal_601410cc214b2.pdf
    • http://umkatrade.ru/698255976627rvy2.pdf
    • http://5coupon.info/number_theory_and_cryptography_coursera_solutions7v8p7.pdf
    • http://kuxni.su/john_deere_garden_tractors_near_meyueuq.pdf
    • http://winoraama.space/27502090539j8yiv.pdf
    • https://cdn-cms.f-static.net/uploads/4460263/normal_6025ac9564f88.pdf
    • https://cdn-cms.f-static.net/uploads/4405907/normal_6015e1e5769e7.pdf
    • https://cdn-cms.f-static.net/uploads/4444644/normal_600cfb12c4b93.pdf
    • https://cdn-cms.f-static.net/uploads/4470825/normal_60534ce807922.pdf
    • http://hocostyle.ru/brave_souls_mod_apk7zfr1.pdf
    • https://static.s123-cdn-static.com/uploads/4374843/normal_5fca374e2749a.pdf
    • http://kernig.online/710316353988klcp.pdf
    • https://static.s123-cdn-static.com/uploads/4416929/normal_5fde06d0388ef.pdf
    • https://cdn-cms.f-static.net/uploads/4483870/normal_604687aa352bf.pdf
    • http://uscreditreport.info/brother_lx_3125_manualnwmi6.pdf
    • https://static.s123-cdn-static.com/uploads/4479454/normal_5fe3eb4c28db3.pdf
    • http://usacreditcheck.info/gesikivavidamepodezm0ob2.pdf
    • http://nadahul.ru/boards_and_beyond_step_1_checklist24g1g.pdf
    • https://cdn-cms.f-static.net/uploads/4503279/normal_604f3e2e2e90e.pdf
    • http://esmoney.site/fomebebovawur5tzma.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://050a9d39-d8a1-4107-8be8-b2b70b72e454.filesusr.com/ugd/5262df_c8c83c64c2a24fe9a14f4b6bf210401b.pdf?index=true
    • https://97d49ff2-d914-4ae4-8ac8-5e5cf5f77cad.filesusr.com/ugd/6350c7_aae67879fb4a46139cc1e4072f658b06.pdf?index=true
    • https://cc6d8859-fc08-4100-a073-55b48c5addfc.filesusr.com/ugd/238140_e380b9a588bc4000a11656659d63d061.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f19f.bin
f0c31c023fb0f218ff49b88399d317d1af90cc02e5cdfa2b670c41e204406e53		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF19F 5612 bytes
font_01_sfnt_off000104a3.bin
c137449ac7a35d96c9cc96d19668b51a6c9eb3148a7cef1531df4a65482d9cad		 pdf-font-stream PDF embedded font (sfnt) at offset 0x104A3 12392 bytes

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