Malicious PDF — malware analysis report

Static analysis result for SHA-256 5aed89c1eff6af6d…

MALICIOUS

PDF

80.8 KB Created: 2021-04-02 22:02:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 108d0fa9c1dee6680bac3f243e346565 SHA-1: 133ea1e6da8070562855c5bd0bcfe3933a66819b SHA-256: 5aed89c1eff6af6dfe5c3508e7674cc3e8507f44e874fe1107900ab98596d91a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are to obscure domains, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards the use of embedded JavaScript for malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://nipisod.ru/strik?utm_term=what+is+my+conflict+resolution+style+quiz
    • https://koligopore.weebly.com/uploads/1/3/4/6/134605833/zurewaduzazawajunu.pdf
    • http://pojebanidik.mywebcommunity.org/jidugamanenerala.pdf
    • https://fefokivaz.weebly.com/uploads/1/3/0/7/130776727/tataxuj.pdf
    • https://cdn.sqhk.co/fifenije/ewUhiIe/free_fire_top_up_store_near_me.pdf
    • https://nuzozixajalupik.weebly.com/uploads/1/3/0/7/130739607/polekus.pdf
    • https://mibinataxufix.weebly.com/uploads/1/3/1/4/131438539/7a9bb3d68d4e.pdf
    • https://cdn.sqhk.co/duxivutunum/cYhegeY/vozimame.pdf
    • https://texitanoz.weebly.com/uploads/1/3/0/7/130739996/zudatuk.pdf
    • https://fosaxobe.weebly.com/uploads/1/3/4/8/134882536/sozujejulumixavux.pdf
    • https://xizexinapak.weebly.com/uploads/1/3/4/3/134359948/barusizi.pdf
    • http://xokapik.mywebcommunity.org/sozudobofepezasibipin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://832c8a8d-f05d-46e3-9166-97d9de82ace4.filesusr.com/ugd/432509_b114a0be20e049929f6e172ac2dcd268.pdf?index=true
    • https://52b03d57-94e3-497b-b2ee-5a576b8f136c.filesusr.com/ugd/67ae49_15054197fba44955abf55762d7e90036.pdf?index=true
    • https://s3.amazonaws.com/megujobemegor/fixed_asset_capitalization_policy_template.pdf
    • https://s3.amazonaws.com/megodipewukitoj/how_to_be_filthy_rich_in_rising_asia.pdf
    • https://s3.amazonaws.com/gimisorixosu/harry_potter_house_quizzes.pdf
    • https://s3.amazonaws.com/fopalew/echo_user_input_bash.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f7a5.bin
7916ee1941c50c4a62b77f30edf9d1851c74cb3f5e39344010df68914f38833a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A5 5412 bytes
font_01_sfnt_off00010a05.bin
4fb87ce1a6e7b5632261924a709a2815ff7ede04e0a52925b176599d54224d72		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A05 12584 bytes

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