Malicious PDF — malware analysis report

Static analysis result for SHA-256 20bdd9265ee67ee5…

MALICIOUS

PDF

69.7 KB Created: 2021-02-23 02:06:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6242cebb766434196e524517f77f600e SHA-1: 433533a8e1bb94d75af3a46a05a367223afee190 SHA-256: 20bdd9265ee67ee5fbab9019c5d47b07499dd92d451e5e80e7752045374da2b7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to deliver second-stage payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://bologen.ru/strik?utm_term=great+northern+popcorn+popper+8+oz PDF link annotation
    • http://kyponnik.online/mazak_online_manualshbdsz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446914/normal_6021451ce99ca.pdfIn PDF document text
    • http://eroganoficial.site/30591810239apxn8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403271/normal_60005dbfcd7e5.pdfIn PDF document text
    • http://idem-peshkom.ru/wesemagubil6ipvs.pdfIn PDF document text
    • http://passive-income.ru/bojuxinoroledih7omk.pdfIn PDF document text
    • http://agentsoft.space/hearts_fc_stadium_mapz9kr7.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/gjiiggV/10858469712.pdfIn PDF document text
    • http://mon-cmbretagne.com/kokutabivijipevevna441.pdfIn PDF document text
    • http://znakomstva18x.site/how_do_you_spell_street_creditsb6ocp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420939/normal_5ff943e64016b.pdfIn PDF document text
    • https://cdn.sqhk.co/jebavimot/je9Digb/rezevegidarewijafaka.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413865/normal_5fe8582ccb648.pdfIn PDF document text
    • http://souve.me/busy_busy_song_djbaapa03zw.pdfIn PDF document text
    • http://igrarazuma.info/droid_jump_apkrgy7b.pdfIn PDF document text
    • http://volosaty100.xyz/britax_marathon_70_g3_weight_limitzefbw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369936/normal_601ca4c10ef5e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_6029a32ee7365.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In 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_off0000c87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC87D 4828 bytes
SHA-256: 53c5715a1b33c8bcb8bab40d93064fefb2c323baebfaf3ec450a012bd3834e34
font_01_sfnt_off0000d8d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8D4 10156 bytes
SHA-256: cf30997495ec9abbd52f8e3bf34be88fbcd4e398be5811de779cd825b272ccc7
font_02_sfnt_off0000fb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB90 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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