Malicious PDF — malware analysis report

Static analysis result for SHA-256 032c5075a9f73be6…

MALICIOUS

PDF

79.8 KB Created: 2021-02-11 00:13:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6e69c1cdd3513b2421f24efcd889f890 SHA-1: f202449fa85f28b1cdd682a31ea8f240187abb61 SHA-256: 032c5075a9f73be6a33abd55bdd8b613b7fd7b5ea5527857def4b020d788077b
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs point to potentially malicious domains, and the document body, though heavily obfuscated, contains references to wkhtmltopdf and a date, consistent with a generated document designed to appear legitimate.

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://maypoin.ru/123?utm_term=cast+iron+electric+griddle+amazon
    • https://cdn.sqhk.co/lobitukojuro/x2Ahfje/linen_cabinets_for_sale.pdf
    • https://cdn.sqhk.co/rilixuzewiv/ifjjLP7/vototozuzebomexoboxazake.pdf
    • https://wubinuju.weebly.com/uploads/1/3/4/6/134642725/3864ea472fa7.pdf
    • https://cdn.sqhk.co/xefilelo/jjchihh/31197783714.pdf
    • https://javufivupa.weebly.com/uploads/1/3/4/3/134349262/diwolaxadile.pdf
    • https://cdn.sqhk.co/rapawaferew/oieijge/suveguvodonin.pdf
    • https://cdn.sqhk.co/bekutojeke/ggjfueZ/wordplay_crossword_clues_nyt_late.pdf
    • https://cdn.sqhk.co/kawonidoza/hh3ZEtu/wiluresuxabosogowovesato.pdf
    • https://balijijileg.weebly.com/uploads/1/3/4/5/134505585/piwafirobinan.pdf
    • https://cdn.sqhk.co/nuzinipaz/gjr7idB/mexican_halloween_makeup_tutorial.pdf
    • https://cdn.sqhk.co/puvubuzu/AhjGQWs/fufax.pdf
    • https://baxuzenaxifo.weebly.com/uploads/1/3/2/6/132681834/0c3f255d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/warapagefasovi/bhoothnath_returns_song_ming.pdf
    • https://s3.amazonaws.com/regovadeje/curriculum_vitae_template_word_with_photo.pdf
    • https://s3.amazonaws.com/benubapopikaj/bumblebee_piano_sheet_music_free.pdf
    • https://s3.amazonaws.com/dewazewokib/kebomilavunamolajip.pdf
    • https://s3.amazonaws.com/xoxaneral/days_of_wine_and_roses_lead_sheet.pdf
    • https://s3.amazonaws.com/zumezeviwakiz/good_antivirus_app_for_android.pdf
    • https://s3.amazonaws.com/levumoduf/archero_mod_apk_unlimited_money_only.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_off0000fc37.bin
e684d77895a95ce3ce1a89cbbb871e5bce7affe2f8fdc83e22cdcfcfd346ddd4		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFC37 5216 bytes
font_01_sfnt_off00010dd9.bin
dd60bc54b04d6ecd6015e1b432ba168e088c63344ed5d260919aed0e8e5a3272		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10DD9 10572 bytes

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