Malicious PDF — malware analysis report

Static analysis result for SHA-256 815240c81090d7f2…

MALICIOUS

PDF

74.2 KB Created: 2021-02-25 19:40:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 5b1bc18dd0fdff294188bd62e80dbaf7 SHA-1: ab9685568fb08855b90a005cbbf9e118286c398e SHA-256: 815240c81090d7f2abcee41c74798ddf4635e7c5bd4dd4cc1f2ab795141b35da
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for phishing or distributing further malware. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of links, suggesting a malicious intent to redirect users to potentially harmful sites. While no scripts were explicitly extracted, the presence of embedded URLs and the ML classifier's high confidence score point towards a malicious document designed for user redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://maypoin.ru/wb?keyword=boss%20ve-2%20user%20manual PDF link annotation
    • https://cdn.sqhk.co/desogepupema/gidRVgf/90292996077.pdfIn PDF document text
    • https://cdn.sqhk.co/gulifunanale/ahajhhj/bubble_pop_puzzle_game_legend.pdfIn PDF document text
    • https://cdn.sqhk.co/semiwewedazi/cgg7ie0/86445945394.pdfIn PDF document text
    • https://cdn.sqhk.co/xejexeremiso/Pqietrx/draughtsman_s_contract_imdb.pdfIn PDF document text
    • https://cdn.sqhk.co/xinulezebi/15Hojhn/ridodejok.pdfIn PDF document text
    • https://cdn.sqhk.co/rigizisojix/HpFKvia/colony_wars_red_sun_iso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383165/normal_5ffcd819dbab5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_601ef6fe6a9f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402000/normal_602f0096edc84.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/ghaincu/gangster_bad_boy_hd_wallpaper.pdfIn PDF document text
    • https://vapevaka.weebly.com/uploads/1/3/1/4/131407737/weladuxebo.pdfIn PDF document text
    • https://sovopubi.weebly.com/uploads/1/3/0/7/130775052/baratutudetiluxu.pdfIn PDF document text
    • https://cdn.sqhk.co/bilexodofose/SheeYhd/22495416331.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/bqhcih4/dark_heroes_battle_cats_review.pdfIn PDF document text
    • https://cdn.sqhk.co/fudamozomeb/itjc9hc/ratexitamafedidikogejan.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382638/normal_5ff8fdd734eee.pdfIn PDF document text
    • https://cdn.sqhk.co/zevinikiwi/J6giijo/chisel_and_bits_modpack.pdfIn PDF document text
    • https://newadagunezadev.weebly.com/uploads/1/3/4/6/134684801/fonut_sajutelajo.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e4ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4ED 5104 bytes
SHA-256: 4d649f37e84344480c87ced90902b46fedf509f862dffb6d9dbc47b992da0f84
font_01_sfnt_off0000f63e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF63E 10736 bytes
SHA-256: 125299c1fee5f02db688e200eeb246e4885fe39a53c3539f3b07b85184c7a74b

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