Malicious PDF — malware analysis report

Static analysis result for SHA-256 4d5edaca2e5c7998…

MALICIOUS

PDF

82.8 KB Created: 2021-03-29 01:53:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9e6cf4538f5f1644b7d29ca4b5ade561 SHA-1: d5ecf912b26845297148cc64f7bcd7d662ce67dd SHA-256: 4d5edaca2e5c799836e211d47d339be43ec0b91ff66c4e95f76012f331bfe397
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification yielded a high score for maliciousness. The embedded URLs and the heuristic firings strongly suggest a phishing or malicious content distribution scheme, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=trane+xr90+installation+manual
    • https://fanepolareroroz.weebly.com/uploads/1/3/4/6/134666972/5696992.pdf
    • https://cdn-cms.f-static.net/uploads/4454671/normal_602365b231fd3.pdf
    • https://kilavolofijon.weebly.com/uploads/1/3/1/1/131164174/xuwutakeg_famivixanopoluv.pdf
    • http://jurojegame.getenjoyment.net/codices_latini_antiquiores.pdf
    • http://jadaribod.mygamesonline.org/cahier_d_exercices_le_nouveau_taxi_1_answers.pdf
    • http://bulibujirifubof.scienceontheweb.net/68972937196.pdf
    • http://bestsaleshopin.xyz/special_operations_combatives_program_manual8rv1l.pdf
    • http://ovca.space/345007100977qjoq.pdf
    • http://toluvubub.mygamesonline.org/resistors_capacitors_inductors_diodes_transistors.pdf
    • https://cdn-cms.f-static.net/uploads/4492593/normal_601a2ec4cf87a.pdf
    • http://sagedix.medianewsonline.com/aikido_historia_y_filosofia.pdf
    • https://static.s123-cdn-static.com/uploads/4446015/normal_6006b78cb925f.pdf
    • https://tudegikugil.weebly.com/uploads/1/3/5/3/135317618/dowipavenosuxitag.pdf
    • http://bigowet.xyz/what_size_bolts_to_mount_panasonic_tvdvi7n.pdf
    • http://pekibexuvipeve.scienceontheweb.net/bafg_antrag_formblatt_1.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9e269ae7-c3cf-4b9f-bde2-1d9be064b7bf.filesusr.com/ugd/139869_9abab3762eaa4b01a5f09f67f05719e7.pdf?index=true
    • https://336ddc11-c37d-4cd6-9685-7accad2975f7.filesusr.com/ugd/479fa9_b40e3f6b9a0e4bb9bf14c5426b12cf89.pdf?index=true
    • https://409b2d23-5c1d-402e-97df-26c0da9299b0.filesusr.com/ugd/2e3d42_b0a359ccf445470caa5a910e88930fa7.pdf?index=true
    • http://bekusisit.atwebpages.com/zefepipeku.pdf
    • http://vebusatoro.atwebpages.com/engineering_mathematics_ka_stroud_5th_edition.pdf
    • https://54fa3baf-6954-44a2-98df-2137f0cc340f.filesusr.com/ugd/14b79e_bba57eee9e8d472b9678a40124204dc4.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_off0001044d.bin
3b43956754d8d3f157bb2d709dbde0dc9078e89775297f43a589e9e0eb83602d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1044D 5148 bytes
font_01_sfnt_off000115b4.bin
d11889c10982bdd9446797f00bf6a1d0dbae6dbbfa7eff1891ee32ed673d0942		 pdf-font-stream PDF embedded font (sfnt) at offset 0x115B4 11916 bytes

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