Malicious PDF — malware analysis report

Static analysis result for SHA-256 5143b0e3de87400c…

MALICIOUS

PDF

76.2 KB Created: 2021-03-29 20:28:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f5c302397e9c953201ef792baf717dba SHA-1: d6a3e80122861314b567ce51916814cd4b6e19c2 SHA-256: 5143b0e3de87400ce222ef4563a0c96f3befd19eb5017fbc0be975ee11a372ad
186 Risk Score

Malware Insights

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

The PDF file contains a significant number of external links pointing to disposable domains, indicating a link farm designed to redirect users. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML classifier score further support its malicious nature. The document body, though heavily obfuscated, contains a title related to English verbs, suggesting a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 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://zajinet.ru/strik?utm_term=25+verbos+irregulares+en+ingles+presente+pasado+y+futuro PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393183/normal_602a1ef2ec438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_5fc6f1cc7eaa5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392869/normal_6041f031ea18d.pdfIn PDF document text
    • https://torovuzexas.weebly.com/uploads/1/3/2/7/132710592/bituzesabeku-lazupu-wugokupone.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_6025ebd5b97ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_601edcbd94350.pdfIn PDF document text
    • https://nozukevanof.weebly.com/uploads/1/3/5/3/135392293/lageborakop.pdfIn PDF document text
    • https://mudobimug.weebly.com/uploads/1/3/4/8/134853100/7721402.pdfIn PDF document text
    • https://fofifakexetag.weebly.com/uploads/1/3/4/3/134345684/9403284.pdfIn PDF document text
    • https://tevaxuxelajuri.weebly.com/uploads/1/3/2/7/132712575/3449247.pdfIn PDF document text
    • http://bufizuz.22web.org/51592155745.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495550/normal_60594468cede7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nabifasilazug.rf.gd/54202243336.pdfIn PDF document text
    • http://gasigigi.rf.gd/kenshi_armor_smithing_guide.pdfIn PDF document text
    • http://defisatum.epizy.com/32835778821.pdfIn PDF document text
    • http://xuzupazona.epizy.com/gepevon.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dcda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCDA 5672 bytes
SHA-256: b52979e11e1156ca77aea00ec49ec1a4f21935566cb7276470421d4138d7b3ba
font_01_sfnt_off0000f038.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF038 4440 bytes
SHA-256: a7c276b4e331fbaeb287568694f60e5c1503aaea4f32242db1d12faf9c2f25d1
font_02_sfnt_off0000fc21.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC21 11324 bytes
SHA-256: 50bfdd486e7db5a86e2b32aef2c2c49be63553e950ee82d271d9ac0e34395110

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