Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bdb34bcbfebf4a…

MALICIOUS

PDF

89.5 KB Created: 2021-03-18 21:13:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 822aa61e1fd841635ab3da0d8b116db3 SHA-1: 75bf87fc098ef660b3efefbb14b77a33afd4114d SHA-256: b3bdb34bcbfebf4a1fdf2c3b1195ad5b3eb5d226b91f2ec55836cefa24215d32
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing. Although no scripts were extracted, the presence of numerous external links and the heuristic findings point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • 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 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/strik?utm_term=trane+furnace+heat+exchanger+warranty PDF link annotation
    • http://wide-take.top/what_is_fsot_testpsd2w.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386079/normal_5ffe532142362.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/f83idVX/throw_knife_call_of_duty_ghosts.pdfIn PDF document text
    • https://cdn.sqhk.co/bogovureg/MhXjckN/ganpati_atharvashirsha_in_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421783/normal_602ca9abf17a0.pdfIn PDF document text
    • https://cdn.sqhk.co/sepetuvab/6ih9hbT/ferijipuvirowujaloma.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450516/normal_5fe0775771f6d.pdfIn PDF document text
    • http://soldonlittleton.com/eye_makeup_brush_guide2nt5w.pdfIn PDF document text
    • https://cdn.sqhk.co/benanejufa/dQjJ5hd/brawl_stars_wallpaper_mortis.pdfIn PDF document text
    • https://cdn.sqhk.co/fudixaxogub/GgjcJsX/modern_warfare_season_6_release_date.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454286/normal_5fdde69a0ef47.pdfIn PDF document text
    • http://trells.space/gexupelusipusevutfwvqa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480598/normal_601e80f01e55b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://275320ff-96dd-455a-9699-a0fdc58b27a5.filesusr.com/ugd/943725_858c3ceaf9d9432bba1ffbe615da596c.pdf?index=trueIn PDF document text
    • https://2daccc73-8708-4113-a26a-4f38906335d9.filesusr.com/ugd/f65175_716a03c180994059887213936cf0c1f4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c886db6-bb56-4e0d-87a5-a60317957354/nikon_speedlight_sb-600_wont_turn_on.pdfIn PDF document text
    • https://s3.amazonaws.com/bezorito/walidopuditew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/031265aa-2029-4208-a8ff-a1c6408462e2/28376133784.pdfIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/pdf_to_word_converter_software_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d52495a3-e127-41aa-9b7f-cddf995e30b4/xumub.pdfIn PDF document text
    • https://bf68d742-fb98-404a-ab47-1dcf24f7df52.filesusr.com/ugd/83e7fd_fdcb5e36206445d2ad1a04c8fd1ce08b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/zabomoxeroza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f5e5fb5-a10d-47d1-bea1-a19b7101b6ca/nexabovagutomalizi.pdfIn PDF document text
    • https://748f1d53-d141-46c1-926a-d14fc69713a3.filesusr.com/ugd/e3ed1f_270767a834214c09961adf666989d062.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_off00011e3f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E3F 5144 bytes
SHA-256: 7dfd0ca24b32bd87c79ece270f602ad57db3d4398ac896bbe61286a9c6413ab8
font_01_sfnt_off00012fdd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDD 11860 bytes
SHA-256: a31c3bb9fc6077acd50cd42f42103dd80aa9d5e0a4966f04590baafe983e7294