Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfb0b99737aaea73…

MALICIOUS

PDF

72.6 KB Created: 2021-02-27 04:45:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 9b1096ef239bbb805ea1130c361c6f39 SHA-1: 02a90c8d0f737c3d922b3b606d11b161e4a9731b SHA-256: cfb0b99737aaea7301fe1d5b6a88f41f138eb3c3fe56316c699738886b102093
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are flagged as part of a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the structure suggest an attempt to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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://botokaw.ru/wix?keyword=travel+team+summary+chapter+1 PDF link annotation
    • http://sudesisobibimit.22web.org/avatar_korra_game_for_android.pdfIn PDF document text
    • http://you-bestshop.xyz/watch_far_from_the_tree_online_freejoc7r.pdfIn PDF document text
    • http://importants.space/sakazenefekikuo9w7z.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/jgicrjf/war_commander_rogue_assault.pdfIn PDF document text
    • https://cdn.sqhk.co/lolajelor/cjgRhdH/80825648209.pdfIn PDF document text
    • http://vehicleinsusa.com/is_the_arc_trainer_good_for_absumnkg.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/qhgF0he/68555130994.pdfIn PDF document text
    • http://vakexuk.22web.org/achalasia_of_cardia.pdfIn PDF document text
    • http://dejuduz.22web.org/trane_xl14c_heat_pump.pdfIn PDF document text
    • https://cdn.sqhk.co/lamajemomu/ejigeih/83840730081.pdfIn PDF document text
    • https://cdn.sqhk.co/letinumi/ZjjfhaH/9528477845.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kopujujezi.rf.gd/somun.pdfIn PDF document text
    • http://bojonovaja.rf.gd/91555208043.pdfIn PDF document text
    • http://vasugam.rf.gd/gexorovakokudevedoza.pdfIn PDF document text
    • http://vibulowivez.epizy.com/35165598972.pdfIn PDF document text
    • http://fevewit.epizy.com/bulixamukepavuzozan.pdfIn PDF document text
    • http://dadorisisewane.epizy.com/68049049800.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_off0000e18a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18A 5336 bytes
SHA-256: eacdb613716593fe49fac67d41c15e30e91ad3adb83979ed17d80e9c17023d80
font_01_sfnt_off0000f391.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF391 9932 bytes
SHA-256: 71f474810b477616a0d5b959183fb3c8c5d43b5df82ffd26e887ec86fc630c80

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