Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa6c622843ba6138…

MALICIOUS

PDF

79.1 KB Created: 2021-03-01 12:39:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: 54ac79de89da5425b1bcb8528d547afb SHA-1: d6e46c0dcc70ca4fc31ebf4a51dc191e67c651f6 SHA-256: aa6c622843ba613887c445e8396719004f9bced6569fe4a600b87102efb4d854
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 highlighted as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate maliciousness. The primary malicious URL, disguised with a search query, likely leads to a phishing or malware distribution site.

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://jottigo.ru/strik?utm_term=games+like+nancy+drew+for+pc PDF link annotation
    • https://cdn.sqhk.co/rokijatu/g7Ujggf/78209254384.pdfIn PDF document text
    • https://cdn.sqhk.co/bufomofa/icFqHhd/international_calls_three_add_on.pdfIn PDF document text
    • http://poradoit2.site/my_aux_button_not_working_toyota_camry2dmsr.pdfIn PDF document text
    • http://volosaty100.xyz/zuwepejudodoluruwny.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/bmhOyig/lucky_block_command_ps4.pdfIn PDF document text
    • http://kzrovk.xyz/43349755079nluph.pdfIn PDF document text
    • https://cdn.sqhk.co/noxivudeva/jcSifoJ/the_snake_vs_block_addictive_game.pdfIn PDF document text
    • https://cdn.sqhk.co/mubutuve/eLjdhiT/ninja_fighting_techniques.pdfIn PDF document text
    • http://cardioactiveitalia.site/hindi_guitar_songs_with_g_c_d_em_chords57mdn.pdfIn PDF document text
    • http://specrazreshenie.com/reguwovakuwozokivekipon6eva6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379237/normal_5fe2c8f21c116.pdfIn PDF document text
    • https://cdn.sqhk.co/jomawutid/qiijgRm/mtg_commander_2020_review.pdfIn PDF document text
    • http://lg-supportteam.com/poweredge_r440_rack_server_datasheetti55e.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwovodegi/fiaKFHi/nimidusuxofe.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fedufiporara/familial_cerebral_cavernous_malformation_symptoms.pdfIn PDF document text
    • https://s3.amazonaws.com/zumezeviwakiz/72017370468.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/bosnisch_lernen.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/english_grammar_for_child.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_off0000f6f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F3 5592 bytes
SHA-256: 6a27ffc10ca900a5174b06dfbbfdbd4a18d6a158db004bbb5ff482e91a420171
font_01_sfnt_off00010a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A03 10940 bytes
SHA-256: 3971b63705136ad619a83a5766795a7f032d30c9bffa6554eb1eb42d4cf8ca13

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