Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd89210120348b2b…

MALICIOUS

PDF

73.4 KB Created: 2021-03-25 08:31:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 90f90f5a06e6d2dc17327b96f2407a69 SHA-1: 22c067f89a430553fe36e29258058240f30f85de SHA-256: bd89210120348b2bab8a8999b4ac759f941d2bd701a24aedc196e6d777313135
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, many of which point to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and a high ML score further support its malicious nature. The embedded URLs and the overall structure suggest an attempt to redirect users to phishing sites or download further malicious content, likely exploiting PDF vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://botokaw.ru/123?utm_term=clash+of+clans+pc+no
    • https://cdn.sqhk.co/zatovafer/cRSUPgh/29703852504.pdf
    • https://cdn-cms.f-static.net/uploads/4480162/normal_5fd8a0b1ee2da.pdf
    • https://cdn.sqhk.co/nepajenine/4WaPjfj/501_free_new_escape_games_2_level_89.pdf
    • http://eurofamily.pro/what_humidity_should_i_set_my_dehumidifier_to_in_the_basement85jh1.pdf
    • https://cdn.sqhk.co/letarezetap/Goge6ib/lean_bulk_workout_plan.pdf
    • https://faxigokoge.weebly.com/uploads/1/3/0/7/130775726/3455411.pdf
    • https://cdn-cms.f-static.net/uploads/4480173/normal_603ad1b49eabd.pdf
    • https://static.s123-cdn-static.com/uploads/4455884/normal_5fcb1002bdde5.pdf
    • https://loloxanasi.weebly.com/uploads/1/3/4/7/134712840/8112210.pdf
    • https://static.s123-cdn-static.com/uploads/4378382/normal_5ff32467eb338.pdf
    • https://cdn.sqhk.co/pumopivosoba/piiTNcv/dumb_ways_to_die_3_world_tour_poki.pdf
    • https://cdn-cms.f-static.net/uploads/4446642/normal_602733b63a4fe.pdf
    • http://topcreditmonitoring.info/femexezavoopjzw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tanikanaw/ruzotabakodukonujoximiw.pdf
    • https://s3.amazonaws.com/kezemiradigu/the_nullification_crisis_worksheet_answers.pdf
    • https://s3.amazonaws.com/benubapopikaj/lusasuput.pdf
    • https://s3.amazonaws.com/tobovunoberiki/game_dev_tycoon_mobile_guide.pdf
    • https://s3.amazonaws.com/papuja/wedopemubutitofo.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_off0000d8ea.bin
bb538dcdd46c431488429470d0e756728ba8d579af30ec8466cf61603a1a02a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD8EA 4912 bytes
font_01_sfnt_off0000e9a4.bin
8077d3a41316e90e9a7eb1abdb902d38069f9424248ed449e624227a189f1190		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE9A4 15452 bytes

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