Malicious PDF — malware analysis report

Static analysis result for SHA-256 b5e8bf1a20655ebc…

MALICIOUS

PDF

76.5 KB Created: 2021-02-25 17:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: a0c33a5db42c957626418281f2fdf44a SHA-1: 05150a245724a7d09f1934fdc3a9f82d7d09578e SHA-256: b5e8bf1a20655ebc0307d4bcd818a71ff620889218e8c5a17dcd3d8c21f4c775
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of multiple external URIs, including one pointing to a link farm on disposable hosting, suggests an attempt to redirect users to potentially harmful content. The document body, though heavily obfuscated, contains a title related to 'codependency' and references wkhtmltopdf, hinting at a lure for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://seumenha.ru/award?keyword=how+to+understand+codependency PDF link annotation
    • https://cdn.sqhk.co/tosobulig/yhhshbA/76801221637.pdfIn PDF document text
    • http://dosijefa.mypressonline.com/how_to_use_a_greenlee_digital_multimeter.pdfIn PDF document text
    • http://pokawibu.iblogger.org/huckleberry_finn_banned_book_reasons.pdfIn PDF document text
    • http://dajexori.mypressonline.com/all_my_sons_arthur_miller_summary.pdfIn PDF document text
    • http://fastgetme.online/mixonovojizibuwuzinapelij46e2i.pdfIn PDF document text
    • https://cdn.sqhk.co/gobuwovuv/AV8cyhh/zubuziwebamiwokavato.pdfIn PDF document text
    • https://cdn.sqhk.co/tipefimex/F69hgUF/27453065938.pdfIn PDF document text
    • https://cdn.sqhk.co/fesakesovoka/iejehid/42090044640.pdfIn PDF document text
    • http://jejobuxamemas.22web.org/5591503443.pdfIn PDF document text
    • http://kanaxade.mygamesonline.org/65239417402.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fufajapikimideb.epizy.com/medetinutuvuxorevivalip.pdfIn PDF document text
    • http://moxutomib.rf.gd/confisses_agostinho_de_hipona.pdfIn PDF document text
    • http://nezopodadas.epizy.com/nsfas_application_form_2020.pdfIn PDF document text
    • http://zunufofidufup.rf.gd/81703852266.pdfIn PDF document text
    • http://fonivez.epizy.com/poisson_distribution_example_problems.pdfIn PDF document text
    • http://rizukapusapanom.rf.gd/how_to_use_duraflame_infrared_heater.pdfIn PDF document text
    • http://dakafatuvuguviz.atwebpages.com/games_to_play_with_4th_graders_on_zoom.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_off0000eee7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEE7 5192 bytes
SHA-256: bfe4a98c58c51bc7d190e563996d038115bd0f1ab254360e6e44531e3533a338
font_01_sfnt_off000100b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100B4 10660 bytes
SHA-256: 680a7ccc31328f323fa4edf8fd271a43648f6a91d8530b58047d35eceefbce98

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