Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfed31c0db6f7549…

MALICIOUS

PDF

89.3 KB Created: 2021-03-24 18:29:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: da48508e203e80ca96b84911006e855b SHA-1: 5561f701f020e81253343289012438f7d8c18c09 SHA-256: bfed31c0db6f75495ea4b2df9ee03c668ce2b6c748c9359b098beb40a1e4f7c0
156 Risk Score

Malware Insights

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

The file is identified as a malicious PDF by multiple heuristics and a machine learning classifier. It contains numerous external links, with a critical heuristic flagging it as a potential link farm. The embedded URLs suggest an attempt to redirect users to potentially malicious sites for phishing or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=vishnu+sahasranamam+lyrics+pdf
    • http://akmurzina.com/house_of_usher_movie_postervq112.pdf
    • https://fuvetozexogix.weebly.com/uploads/1/3/0/8/130874326/5962841.pdf
    • http://carishr.com/how_do_you_replace_a_water_heater_elementp7u1e.pdf
    • http://kind-insta.site/hamilton_beach_electric_kettle_40893_manual8mma3.pdf
    • http://lnstagramsupportinfo.com/vijamanefobumitomkfv3.pdf
    • https://gemajoxow.weebly.com/uploads/1/3/4/7/134721961/3c790cfd390e.pdf
    • http://thehensleys.org/human_resource_management_strategy_and_practice_nankerviskq2lg.pdf
    • http://limecash.xyz/how_to_repair_hp_laptop_broken_hingezy3bs.pdf
    • https://wutadesojijemez.weebly.com/uploads/1/3/4/3/134393937/3028306.pdf
    • https://pizugonuju.weebly.com/uploads/1/3/1/8/131856050/nonewebebukopujunis.pdf
    • http://b0xberry.online/kawosojaxigogobasuxr73h.pdf
    • https://kikosezuzo.weebly.com/uploads/1/3/1/3/131378972/xerimalulitozarubuv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://5b949be5-44ef-49af-96c7-0ebaa8fe632e.filesusr.com/ugd/3402b1_0774a2f2613c433faa63e99af87097d3.pdf?index=true
    • https://676a7a22-5bec-432e-92e0-9d4a0a27851c.filesusr.com/ugd/a1fb72_c39b65d849c0463da1996d1cdf6e7ced.pdf?index=true
    • https://6eed613e-cbae-405e-b458-9655ef9033f8.filesusr.com/ugd/e4f6f0_629114741a0c4a959f31509f5ae526db.pdf?index=true
    • https://s3.amazonaws.com/wixanarer/lego_batman_3_game_free_android.pdf
    • https://s3.amazonaws.com/pegebunov/apes_movie_in_tamil.pdf
    • https://s3.amazonaws.com/voxazedisula/4356316366.pdf
    • https://uploads.strikinglycdn.com/files/0922b7c6-5ad3-4dee-85f5-80e4fe699dfb/periodic_trends_worksheet_atomic_radius_answer_key.pdf
    • https://uploads.strikinglycdn.com/files/b8448f17-54b9-42d8-aabc-d3b85755282a/mutoxexaginowuvuzoj.pdf
    • https://uploads.strikinglycdn.com/files/b40dcc54-ab16-482e-9912-60864ac20aff/sportdog_sdt00_battery.pdf
    • https://uploads.strikinglycdn.com/files/606c6e15-fcc1-4891-b1c8-fbf7ddc7d2c4/80198797700.pdf
    • https://s3.amazonaws.com/buwosevax/how_to_pair_two_echo_dots_together.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011265.bin
b8d86541586504c9d9092680de461a4541a3f8e10c44b8dc4e8fe3f2380a043c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11265 5036 bytes
font_01_sfnt_off00012340.bin
7e4177bf4e01960e357d6324430a8d0446f738ccc4aa9191bf52656854dc902b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12340 11744 bytes
font_02_sfnt_off000147fd.bin
4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x147FD 4324 bytes

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