Malicious PDF — malware analysis report

Static analysis result for SHA-256 751134dad52225fc…

MALICIOUS

PDF

79.2 KB Created: 2021-04-01 06:08:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 012a394261d17f486f37ea218a550f5b SHA-1: 9c64fe2af1a63cd425a60cfce5ef087c01f1ceb4 SHA-256: 751134dad52225fc530b55e70ec454b5ed46600f1d4e990625f0df72672228ae
126 Risk Score

Malware Insights

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

The ML classifier and ClamAV detection strongly indicate maliciousness. The PDF contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and URI findings point towards a phishing or malware distribution lure.

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://mezovuduw.ru/award?keyword=habitos+alimenticios+peces+pdf
    • https://sutenemumam.weebly.com/uploads/1/3/5/3/135323571/ralumivokivisugor.pdf
    • http://delinapod.mypressonline.com/how_to_jump_attack_dark_souls_2_keyboard.pdf
    • https://static.s123-cdn-static.com/uploads/4392218/normal_600734b186040.pdf
    • https://nunezexivu.weebly.com/uploads/1/3/4/4/134440215/godagurazof.pdf
    • http://reduslim-shop.website/what_is_a_commercial_motor_vehicle_in_floridakjgs8.pdf
    • http://24goodstore.site/956312713271al6y.pdf
    • http://kuzososo.mygamesonline.org/biwovanenadixenimipemujil.pdf
    • http://disupiwalu.mypressonline.com/nonefexiwile.pdf
    • https://static.s123-cdn-static.com/uploads/4495975/normal_5ff9da0cda1c8.pdf
    • http://creamwalls.space/harry_potter_book_set_ebay_uktieyf.pdf
    • http://sobakin.space/bacteriuria_asintomatica_pediatriab0o2f.pdf
    • https://static.s123-cdn-static.com/uploads/4478383/normal_60062bef7c73f.pdf
    • http://lojasamericanasbr.com/photoshop_for_dummies_youtubed9klj.pdf
    • http://libuwapuvewipev.mywebcommunity.org/which_nitrogenous_base_found_in_dna_and_rna_pairs_with_guanine.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://nejesezape.myartsonline.com/velanibunurome.pdf
    • https://uploads.strikinglycdn.com/files/53715801-a6b1-4c42-a34f-f760317b8351/dell_active_pen_pn557w_compatibility_list.pdf
    • https://uploads.strikinglycdn.com/files/d5f0f621-4dc2-4cab-b6d9-5e1342fde103/pivopawaz.pdf
    • https://uploads.strikinglycdn.com/files/3235a651-4a44-493b-824a-fedb911574df/beowulf_si_grendel_film_online_subtitrat_in_romana.pdf
    • https://uploads.strikinglycdn.com/files/bae9103a-38a1-4436-9b08-67376583448c/how_to_crochet_hair_step_by_step.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f764.bin
2f0c721b8e581171b4ece2336e92697c25a6c47bc9edc80ae858c4b45b37fdd2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF764 5304 bytes
font_01_sfnt_off00010956.bin
ad8d26b59e8986e99ed039dca20d87546c4abbf7b2bdbc790b32ba205679bf3f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10956 11108 bytes

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