Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4b4b2abca7035a4…

MALICIOUS

PDF

71.7 KB Created: 2021-02-08 17:37:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 46a096b3eee4f6a79b62bad45505140b SHA-1: 913fc4192ace3436b19a165b46ebc5ec46d48ad6 SHA-256: e4b4b2abca7035a44f2f6eb6d7a4dfae5c7a1b6323ed3239f4ba726d216e24ab
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The sample is identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing or exploit delivery mechanism. It contains malformed streams and numerous external URIs, including a link farm on disposable hosting, suggesting an attempt to redirect users to malicious content. The PDF structure and embedded URIs indicate it's likely part of a spearphishing campaign designed to exploit vulnerabilities or trick users into downloading further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://leonvi.ru/aws?utm_term=bosch+300+dishwasher+manual PDF link annotation
    • http://lerevujoda.iblogger.org/cisco_catalyst_2960_l_datasheet.pdfIn PDF document text
    • http://itawomen.fun/tebafafegatilalufegeie37s.pdfIn PDF document text
    • http://virnet77.ru/fugosowevifolagede6hkwk.pdfIn PDF document text
    • http://heymama.store/vuromazerob6j2.pdfIn PDF document text
    • http://bostpolamos.site/gefusaxafazamirajodimemuvh7voe.pdfIn PDF document text
    • http://veronaital.space/seluvifegakukumhu8lu.pdfIn PDF document text
    • https://lemapola.weebly.com/uploads/1/3/1/4/131407815/zelupimutawetamoja.pdfIn PDF document text
    • http://vatitafi.22web.org/autocad_2010_32_bit_free.pdfIn PDF document text
    • http://1pokypki.website/mobile_repairing_book_free_download8uxr0.pdfIn PDF document text
    • http://italysummer.space/8-_7_practice_dilations_form_g_answersyq3kt.pdfIn PDF document text
    • https://zexebofefibem.weebly.com/uploads/1/3/5/3/135303963/vobilegivamujo_fovufavib.pdfIn PDF document text
    • http://helps-lnstagramcopyrights-about.com/calculus_with_analytic_geometry_2nd_edition2xhtc.pdfIn PDF document text
    • http://websecurer.tech/guia_completa_de_zelda_ocarina_of_time_n64_en_espaol20s3a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/vavabi/chatuchak_weekend_market_food_guide.pdfIn PDF document text
    • http://xalovizavana.rf.gd/99179184715.pdfIn PDF document text
    • https://s3.amazonaws.com/xakusineba/background_image_for_website.pdfIn PDF document text
    • https://s3.amazonaws.com/lonozote/86264289186.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_off0000d8c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8C1 5624 bytes
SHA-256: 72dd828f359777ca591f94cd162c8caf666fbc52f3bb4a417ff7a81296b233ca
font_01_sfnt_off0000ebc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBC3 11064 bytes
SHA-256: 7c1841796915e239855e0bd04c4e304e9763b50c34f3da6ed48bcdea3da089fc

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