Malicious PDF — malware analysis report

Static analysis result for SHA-256 dca522711d6f2fb5…

MALICIOUS

PDF

93.8 KB Created: 2021-03-24 23:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 674735f41145579d9e38f90ff92dea2d SHA-1: 57f9e0485c62f8029161c8d1bc783917bff9cfe9 SHA-256: dca522711d6f2fb54b23c2467d19a7d49eac7d814aaa130ca34c1d1bec03380d
126 Risk Score

Malware Insights

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

The file is a PDF document that contains numerous external links, many of which point to disposable hosting services, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing lure designed to redirect users to malicious 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://zajinet.ru/award?keyword=fiche+technique+pisciculture+hors+sol+pdf PDF link annotation
    • http://apeech.ru/xulakajabgb810.pdfIn PDF document text
    • https://koturukumofup.weebly.com/uploads/1/3/4/8/134883222/lufupim.pdfIn PDF document text
    • https://sozobuxetezubu.weebly.com/uploads/1/3/4/5/134527793/5500828.pdfIn PDF document text
    • http://persequen.com/white_rodgers_1e78-151_resetly2lg.pdfIn PDF document text
    • https://pifodepap.weebly.com/uploads/1/3/4/2/134235937/bedotufekuniki-puxog.pdfIn PDF document text
    • http://rojoguladewex.iblogger.org/red_itchy_burning_spots_on_skin.pdfIn PDF document text
    • https://xanuzejo.weebly.com/uploads/1/3/1/6/131637194/7963225.pdfIn PDF document text
    • http://podarokinsta365.site/cabal_online_patchj6fhp.pdfIn PDF document text
    • https://xagogijan.weebly.com/uploads/1/3/4/7/134720006/tifizamovitob.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420604/normal_605b842346689.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_604ca4f9bf58f.pdfIn PDF document text
    • http://yachts-4-sale.com/hitachi_12_compound_sliding_mitre_saw_c12rsh23m0t5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496005/normal_5fca12d82c2ff.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_601a50d0ae6d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vigopul.epizy.com/juliet_takes_a_breath_graphic_novel.pdfIn PDF document text
    • http://diwevobu.rf.gd/34658348948.pdfIn PDF document text
    • http://wefazerigibu.epizy.com/alumbre_de_potasio.pdfIn PDF document text
    • http://jifazuniduvosi.epizy.com/samsung_factory_reset_code_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kobivimelelo/free_french_to_english_dictionary_kindle.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/target_marc_jacobs_daisy.pdfIn PDF document text
    • https://s3.amazonaws.com/wixamupelinere/13006081879.pdfIn PDF document text
    • https://s3.amazonaws.com/jeromisixinolib/can_you_tell_if_you_have_scoliosis.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_off0001290f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1290F 5112 bytes
SHA-256: b03113ba31f013272c248c8da2fff2a1fb26b3b1f870780e4c6ad05bf23021c0
font_01_sfnt_off00013a73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13A73 15476 bytes
SHA-256: b6a7d51057c374d1bae5d7a4a0527cbbe09d18b8e4b4b4a3435f3b75686a4ace

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