Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a43beea971ae743…

MALICIOUS

PDF

78.1 KB Created: 2021-05-12 19:53:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f65d84d7fb8f37d4f4044446eec72b8b SHA-1: bd4f261f9cce9cc777b872d1a6fd0086e8559c4f SHA-256: 9a43beea971ae743edd10978a84d497d95340ea65c7a0e2d7a4764b6a6a2601d
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, suggesting a phishing or malware distribution scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of external URIs strongly indicate malicious intent. The ML classifier and ClamAV detection further confirm this, flagging the file as malicious, likely a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://vilenefex.ru/strik?utm_term=kohler+generator+parts PDF link annotation
    • https://ditakusoboke.weebly.com/uploads/1/3/1/4/131437623/xomawi.pdfIn PDF document text
    • https://vuxosulaleko.weebly.com/uploads/1/3/2/6/132695375/faeaa3e8f85ba6e.pdfIn PDF document text
    • http://zaxevef.getenjoyment.net/appendicular_skeleton_labeling_worksheet.pdfIn PDF document text
    • http://sirunome.mypressonline.com/bunexatejivizebakole.pdfIn PDF document text
    • https://ribovaboj.weebly.com/uploads/1/3/0/7/130775049/5060071.pdfIn PDF document text
    • https://sovokuragul.weebly.com/uploads/1/3/2/8/132814371/506b9d4a.pdfIn PDF document text
    • http://sodalabs.pro/xibifi2iyjn.pdfIn PDF document text
    • http://bijepitujutix.sportsontheweb.net/antibioticos_y_su_clasificacion.pdfIn PDF document text
    • http://ravovenovibu.medianewsonline.com/convert_compiled_html_to_free_online.pdfIn PDF document text
    • http://vevaroda.scienceontheweb.net/baruch_spinoza_dios.pdfIn PDF document text
    • https://cdn.sqhk.co/nokotadi/hnDibBi/871730852.pdfIn PDF document text
    • http://fupefabesosada.mygamesonline.org/ropofoxarozoxi.pdfIn PDF document text
    • http://samyog.ru/how_to_add_a_header_in_wixe41dn.pdfIn PDF document text
    • https://cdn.sqhk.co/fuvavegipap/jhimZuk/52678059911.pdfIn PDF document text
    • http://proflist-kursk.ru/15733251518lnecv.pdfIn PDF document text
    • http://zatutajijiti.getenjoyment.net/merit_badge_pamphlets.pdfIn PDF document text
    • http://lowufadit.scienceontheweb.net/newejejaf.pdfIn PDF document text
    • http://zunololanuxigu.sportsontheweb.net/wilajogupo.pdfIn PDF document text
    • https://cdn.sqhk.co/gowamojon/jjn0Zrz/class_12_accountancy_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/vibisidumes/LZgahgs/tubujupodibegereneka.pdfIn PDF document text
    • http://static-start.top/ernest_dale_biografia5b31s.pdfIn PDF document text
    • https://cdn.sqhk.co/zodavujera/5CJY5gg/48488308402.pdfIn PDF document text
    • http://dezowem.medianewsonline.com/magazine_template_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vujuvisesakok.myartsonline.com/rewigima.pdfIn PDF document text
    • http://maretubozewugi.myartsonline.com/32186368130.pdfIn PDF document text
    • http://muzulozak.atwebpages.com/94868391379.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_off0000f159.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF159 5048 bytes
SHA-256: 33b794769c69da743ffd2fb0513fe1352be54f7803adc343f25e8c86583e7caa
font_01_sfnt_off00010289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10289 11696 bytes
SHA-256: b2474e7ea03bb7a261cdfa38b5fe9c9914ee1d4ef077be953c63f1177331c2ee

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