Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b9c294ba839d802…

MALICIOUS

PDF

73.4 KB Created: 2021-03-29 14:02:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 95d524e225ab4cac50b93752beceda11 SHA-1: 7be006407eb4223491f067983568c289d0f18484 SHA-256: 6b9c294ba839d8023aab59db5a1043c0ca252cdc4bed649287df01802576a9c0
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a link farm with numerous embedded URLs pointing to potentially malicious domains. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates a high likelihood of this document being used for phishing or malware distribution by directing users to a network of disposable hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://cdn.sqhk.co/sugifila/Ohfb8jf/19639538159.pdf In PDF document text
    • http://juilopkiretlo.ru/organic_chemistry_brown_8th_ed_cengage21cic.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455377/normal_6011d300008a5.pdfIn PDF document text
    • https://cdn.sqhk.co/litalile/Jje4ghh/sailing_race_timer_apple_watch.pdfIn PDF document text
    • http://blankid.ru/68464063781561sg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408190/normal_601b4933ec9d8.pdfIn PDF document text
    • http://50offstore.info/how_to_replace_delta_shower_knobq58z2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456135/normal_6037480486287.pdfIn PDF document text
    • https://cdn.sqhk.co/pujixefan/ghgfihB/salowewijux.pdfIn PDF document text
    • http://reduslimitalia-official.site/1696783527128dc3.pdfIn PDF document text
    • https://cdn.sqhk.co/pujapipiwat/inge3je/cannon_shooting_child.pdfIn PDF document text
    • http://slmit.fun/chennai_express_movie_song_mingdux6z.pdfIn PDF document text
    • http://setlyb.online/9850028466pkxrd.pdfIn PDF document text
    • http://flowerport.store/singer_heavy_duty_sewing_machine_bobbin_casefij0d.pdfIn PDF document text
    • http://casbah2point0.com/hydrolysis_constant_of_aniline_hydrochloridem1x70.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446781/normal_601f62938df3a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414500/normal_5fe8100450ce4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/vAIYpVcV8Aw/wb?keyword=thank%20you%20mama%20lyrics%20miriam%20makebaPDF link annotation
    • https://s3.amazonaws.com/zatazewoz/jezekanobapirakajijefazu.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/sukezagoliwotiwapebata.pdfIn PDF document text
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_15cfc6ea316b45eeac3e4a79d48a54b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nademopor/chiari_malformation_type_1_wikipedia.pdfIn PDF document text
    • https://8ac5c8e1-9174-427d-95c2-90bebb9f105a.filesusr.com/ugd/44b221_f08064bcc67240029cf261d082d00289.pdf?index=trueIn 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_off0000e08f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE08F 5296 bytes
SHA-256: 343633e4abd8923e62e8bd7868fb7cf0c26e3b61477051fc2853e58a9c8c4580
font_01_sfnt_off0000f26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF26F 11052 bytes
SHA-256: d42d529328898bc57d99f48288b6abad12f18fa07d56eda5dc5229e4398493e3

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