Malicious PDF — malware analysis report

Static analysis result for SHA-256 20380c90533edbb9…

MALICIOUS

PDF

74.3 KB Created: 2021-02-19 05:14:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: e003b0ff3e9bf5db56894a739a5f5e3f SHA-1: 7e365bab9aafa400a6df03a04c9b0515ad95d143 SHA-256: 20380c90533edbb922496af5a640e25ca0dcf86ae51c627e4315ed6c87e8df26
156 Risk Score

Malware Insights

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

This PDF file is identified as malicious by ClamAV and an ML classifier, and it contains a large number of external links, suggesting a link farm for SEO manipulation. The document body and embedded URLs indicate a lure to download PDFs, likely to distribute further malware. No scripts were extracted, but the PDF structure itself is used to host numerous links to potentially malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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=red+letter+bible+pdf+free+download PDF link annotation
    • http://marketop.club/kandidiasis_adalahqqn7o.pdfIn PDF document text
    • https://fezowekufeda.weebly.com/uploads/1/3/3/9/133999429/kewufako-zabobulo-bolanaxufav.pdfIn PDF document text
    • https://jafipununevov.weebly.com/uploads/1/3/0/8/130814040/3388416.pdfIn PDF document text
    • http://mini-cam-v2.club/89386886499qr78p.pdfIn PDF document text
    • http://ag-management.space/penny_press_logic_puzzles13kmr.pdfIn PDF document text
    • https://fokikemapusa.weebly.com/uploads/1/3/1/3/131398543/1013775.pdfIn PDF document text
    • http://nakanilo.club/how_did_alexander_the_great_died_and_what_happened_to_his_familyyv94a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kubafezin/acrostic_poem_template_friendship.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/wowufipenen.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/user_guide_design_template.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/bhootwala_game_karne.pdfIn PDF document text
    • https://s3.amazonaws.com/nerugiraxura/bolixebemusit.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/66024582780.pdfIn PDF document text
    • https://s3.amazonaws.com/vatosolikijike/44121355998.pdfIn PDF document text
    • https://s3.amazonaws.com/ropidadegaxut/dolopadu.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 4884 bytes
SHA-256: a2438d284abd37912d1d2bcc51236957da9a545fc7b9bef431fdfa682a1f706c
font_01_sfnt_off0000eab9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAB9 10552 bytes
SHA-256: b773c2e95bf5649228908b03d9275fa55a19cc0dc2f153d49a91cea0b040628a
font_02_sfnt_off00010e1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E1F 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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