Malicious PDF — malware analysis report

Static analysis result for SHA-256 6566b7d5d32646f7…

MALICIOUS

PDF

82.9 KB Created: 2021-03-25 11:50:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 1bbf276a03c7d6b6ed0121327686de6c SHA-1: 3c7345d0cd5d4225be3a65f651788a5019dc1eb7 SHA-256: 6566b7d5d32646f7d50cf5cf22078ffdf85ace29f2115ba45c8d7f3b7885fe5c
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 hosting, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://ponafet.ru/strik?utm_term=are+colored+diamonds+a+good+investment PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4378845/normal_6019d4cc2fd07.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470035/normal_601dc94203592.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493888/normal_601af1ef3fe8e.pdfIn PDF document text
    • http://komunomaled.iblogger.org/what_is_the_history_of_china.pdfIn PDF document text
    • https://voxepobar.weebly.com/uploads/1/3/4/6/134668427/dd4f505c2.pdfIn PDF document text
    • https://wujipiledulom.weebly.com/uploads/1/3/4/6/134695719/bunogagikasemi.pdfIn PDF document text
    • https://cdn.sqhk.co/barevirus/enZdjbX/53750317431.pdfIn PDF document text
    • https://wuzezabor.weebly.com/uploads/1/3/1/4/131438899/jivebeje_mamuxalivek.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393898/normal_5ff4a26d34e8c.pdfIn PDF document text
    • http://nejamaranidirit.22web.org/fully_fitted_bed_sheets.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375204/normal_6004af8e918d5.pdfIn PDF document text
    • https://cdn.sqhk.co/vetukalujir/gjhf8o4/guzamotokajesodabuj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385435/normal_5ff1c1c6b8143.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450138/normal_5fe6afa693829.pdfIn PDF document text
    • https://cdn.sqhk.co/gasidonoda/Zcgiejb/10159871478.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413846/normal_6012ec687dad5.pdfIn PDF document text
    • https://cdn.sqhk.co/tomubozes/uggijUa/dead_age_wikia.pdfIn PDF document text
    • https://cdn.sqhk.co/pomisiforuko/TdgfKPm/67341259232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421051/normal_60364ab137189.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://709e7e89-b264-4d73-b757-064736ed86f1.filesusr.com/ugd/f523c3_4883ead8e8c74f8aab96ea83556cedf2.pdf?index=trueIn PDF document text
    • http://tafikepuvanotu.epizy.com/bamok.pdfIn PDF document text
    • http://tininababa.rf.gd/bigasuo_projector_manual.pdfIn PDF document text
    • https://d33b8dfc-9792-4d26-9d81-613d0bd32a71.filesusr.com/ugd/d34367_5f68a90df7fb41d49989e630cdbc4476.pdf?index=trueIn PDF document text
    • https://2e6726a7-2e78-456a-9fa1-8bc85c3b20a6.filesusr.com/ugd/76e31d_b0d0a91ff91b4e2da06843c2c9b0a3f5.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_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 5308 bytes
SHA-256: 456b86d5b72f3f57b3f7f3c0b199f287ca4d1c84d793367b0f673793cdf05c67
font_01_sfnt_off00011633.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11633 11720 bytes
SHA-256: 2e0fd835665c585e84cc4f781797354d3950e922e8015740445bab07a55af730