Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3476e432fc72750…

MALICIOUS

PDF

76.6 KB Created: 2021-03-22 20:49:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6fbf39ae595de67ec65c7edeff63efe9 SHA-1: 2f1cd1538faef04051866dc825a2e9b13f7a2e5a SHA-256: b3476e432fc72750557a7515e703551caf2cb4e32e5cb936fc7349414ea17042
226 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious payloads. The heuristic 'PDF_SEO_LINK_FARM' and the presence of numerous unknown reputation URLs strongly suggest this malicious intent. ClamAV detection and ML classification further support the malicious verdict, indicating this PDF is likely part of a phishing or trojan distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 7

  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://golowaki.ru/award?keyword=5+dicas+para+aprender+a+desenhar+do+zero+pdf PDF link annotation
    • https://mumovukejepi.weebly.com/uploads/1/3/1/4/131483147/vaxagadesiduged-xonurebif.pdfIn PDF document text
    • https://bopamoverera.weebly.com/uploads/1/3/1/4/131408256/3873479.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369509/normal_5fdf478c7c132.pdfIn PDF document text
    • https://gujijuxe.weebly.com/uploads/1/3/5/3/135326775/3d187.pdfIn PDF document text
    • http://juwuzomitivewij.22web.org/bodyboss_workout_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461249/normal_60557b031d08e.pdfIn PDF document text
    • http://nevozepamuj.iblogger.org/74685524410.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407064/normal_6054eed293de1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_6045da8ff2a5b.pdfIn PDF document text
    • http://wunenagovaf.iblogger.org/lulitarerokagafiv.pdfIn PDF document text
    • http://gabutetidik.22web.org/zugijamixalij.pdfIn PDF document text
    • https://lodufifed.weebly.com/uploads/1/3/1/4/131411197/5094857.pdfIn PDF document text
    • http://nowatora.22web.org/sciatica_management_nice_guidelines.pdfIn PDF document text
    • https://matelusa.weebly.com/uploads/1/3/1/4/131406649/mudolefurozekin-nonal-widomaki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_74843cf2d39f4dbc91f658aa27fe2a35.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kijelopazekune/xawejizamo.pdfIn PDF document text
    • https://2178e3ec-2e0a-46e0-af35-d8a6fdfeb21a.filesusr.com/ugd/c411cf_5a5c1e731dba4c3da5e629e87c2ca8f1.pdf?index=trueIn PDF document text
    • https://38f9ccf9-db33-4582-994d-0ea518e52d38.filesusr.com/ugd/368de4_addae64d46ce437fa6867bf15319c678.pdf?index=trueIn PDF document text
    • http://foximaxu.rf.gd/tosimunas.pdfIn PDF document text
    • http://lenegimuni.epizy.com/aqeedah_tahawiyyah_english.pdfIn PDF document text
    • https://e0529b0e-ffd4-46ae-8a9e-348c3aa8e3ae.filesusr.com/ugd/27320f_9a82e8b039034050aaae0c8a9aac94d4.pdf?index=trueIn PDF document text
    • https://2b12d24f-0c9a-4a32-b427-430aba395f0c.filesusr.com/ugd/6cfe90_9c4e298f580a40cab2fe18c54e02a43c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vonutavekip/bopojupofa.pdfIn PDF document text
    • http://lolowavedipugis.rf.gd/jogisilonarofaradubudusib.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000eb4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB4A 5288 bytes
SHA-256: c896207c3e12d4a3ab34a360383742e6d59005a185cc878943404d746b458d1c
font_01_sfnt_off0000fd4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD4B 12400 bytes
SHA-256: f037e62d3cbe2516ec469e292c0f2985cce04bc76f3676fade287a0c1346e585