Malicious PDF — malware analysis report

Static analysis result for SHA-256 29bd234765d5cf25…

MALICIOUS

PDF

81.2 KB Created: 2021-04-05 23:02:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 6f84fc01cf3cdf545059fb1cc9c69b53 SHA-1: 7b70df8f57fb9d06a7263071f6dd2a099258473e SHA-256: 29bd234765d5cf25dfdbccc667e44c28b2a1415aae0edeb0fd273e461c95e8d5
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were directly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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=como+ser+un+buen+lider+cristiano+catolico PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427097/normal_6010f73021934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367680/normal_60133e1614839.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4465905/normal_5fe256584a7ad.pdfIn PDF document text
    • http://afracheat9.xyz/ragepodenogupafimign1dnb.pdfIn PDF document text
    • https://cdn.sqhk.co/sewizefaxiki/ij8pUV0/27914415538.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/poguramawomewqbx4.pdfIn PDF document text
    • https://cdn.sqhk.co/pajokiman/4jigchj/worship_songs_chords_key_of_g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457311/normal_602adc6ac3451.pdfIn PDF document text
    • http://xodikiz.iblogger.org/frosty_the_snowman_piano_sheet_music_letters.pdfIn PDF document text
    • http://naturaleone.space/logitech_z-5500_firmware_upgrade6k0vy.pdfIn PDF document text
    • http://contact-git.top/16338800889ql7dz.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/gjjbheq/21903589491.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404955/normal_605ffdbe13ef1.pdfIn PDF document text
    • http://xulubapatoso.scienceontheweb.net/chick_fil_a_honey_roasted_bbq_sauce_nutrition.pdfIn PDF document text
    • http://rizovog.iblogger.org/vectors_and_scalars_questions_and_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/pajegili/MVjjDjg/love_stories_hollywood_movies_imdb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vobikeretuwof.atwebpages.com/82919054362.pdfIn PDF document text
    • http://xejobutek.onlinewebshop.net/kuremer.pdfIn PDF document text
    • http://gejopap.rf.gd/vaveropinukevidarine.pdfIn PDF document text
    • http://zobawukesilebaf.epizy.com/81085794285.pdfIn PDF document text
    • http://virojokezof.rf.gd/ms_sql_server_tutorial.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_off0000fb6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB6E 5128 bytes
SHA-256: 2f2ae0c9e156f323bb47040259065e58de7445fce21e2f4d01b0edeeb7aeb01f
font_01_sfnt_off00010cbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CBB 12776 bytes
SHA-256: c1f3ef94f91ea2d54da028c492d15819f857a219a5324f78c33db17c6669b74e

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