Malicious PDF — malware analysis report

Static analysis result for SHA-256 0337468b5c869bf3…

MALICIOUS

PDF

70.7 KB Created: 2021-04-04 20:15:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bf214d6e0485808f7acdb09e44104940 SHA-1: 75ae16cef381addf481523312ac39c1ed48bc2a8 SHA-256: 0337468b5c869bf3fa30551c248a950be6b32b431687e068c8d1c2686056dd04
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating a link farm or SEO manipulation tactic, with one URL specifically noted as a potential download lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the presence of embedded URLs and the overall structure point towards a phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://vilenefex.ru/123?utm_term=boss+de+ne+number+song+ringtone
    • https://pabaxovazat.weebly.com/uploads/1/3/4/3/134323574/1793400.pdf
    • https://kumobavubisu.weebly.com/uploads/1/3/0/7/130775432/gumogepa_fomubanetizeduw_zajokogadewawup.pdf
    • https://likuwiwekadu.weebly.com/uploads/1/3/1/8/131857000/jovega.pdf
    • https://cdn-cms.f-static.net/uploads/4368226/normal_604b53735948f.pdf
    • http://perfectiona.online/how_to_connect_ht-ct390_subwooferxuybn.pdf
    • https://cdn-cms.f-static.net/uploads/4485935/normal_60141d39b4688.pdf
    • http://lastmarkt.ru/pedagogy_of_the_oppressed_chapter_1v3lqk.pdf
    • https://cdn-cms.f-static.net/uploads/4405953/normal_604c9c8301041.pdf
    • http://ropufogesuzazeg.iblogger.org/mosoxaxoxazotu.pdf
    • https://xezitolisaja.weebly.com/uploads/1/3/1/4/131406502/suganubeze.pdf
    • https://zopojezumaze.weebly.com/uploads/1/3/1/6/131637354/5325257.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • http://xaminelabiz.epizy.com/36418489336.pdf
    • https://s3.amazonaws.com/jeduzizonox/bukuniwuwewevaniw.pdf
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_8a15b1ad60a84a3d8420b844c81ffd0e.pdf?index=true
    • https://6e337ffa-6c75-4e98-916f-0cab85e7e3f5.filesusr.com/ugd/a22560_4b5d71d8690143b69d12a6ff50c1fdb3.pdf?index=true
    • https://s3.amazonaws.com/farefasejikap/tixujekefe.pdf
    • https://s3.amazonaws.com/zifozujiwi/3434244955.pdf
    • https://f1801c53-b3f5-4b94-a9b3-4bb8eb376a66.filesusr.com/ugd/af633f_949d7ceb322f4dbe959273cdeef96bb5.pdf?index=true
    • https://41be308f-8a64-4dec-8b30-4937605be974.filesusr.com/ugd/f042fe_d10b61e093ff48878441020f215a0f8a.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca19.bin
81c4d6020c99f340ca724bad435752b94a7cd9ac3f5fa0b870f2e8bba8cadc77
pdf-font-stream PDF embedded font (sfnt) at offset 0xCA19 4972 bytes
font_01_sfnt_off0000dadf.bin
2df63df71bea3af572fb474ff2ad8db606a08230068dfca0db64c19033078f67
pdf-font-stream PDF embedded font (sfnt) at offset 0xDADF 10728 bytes
font_02_sfnt_off0000ffac.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f
pdf-font-stream PDF embedded font (sfnt) at offset 0xFFAC 4324 bytes