Malicious PDF — malware analysis report

Static analysis result for SHA-256 10a0dd735495a432…

MALICIOUS

PDF

72.3 KB Created: 2021-03-14 03:03:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: ceb40e270b7423d46b85965f5a9fa8fa SHA-1: cdba076d341cfdb654a9b1d2ec9defd74350f0c1 SHA-256: 10a0dd735495a432bef5dce765077a1a979e0a2a36eddd625364453168d09a06
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous external URLs, many hosted on disposable domains, suggesting a link farm or redirection mechanism to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating the PDF is designed to funnel traffic to a large number of distinct, low-reputation hosts. While no scripts were explicitly extracted, the PDF structure itself likely contains embedded JavaScript or exploits to facilitate redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/123?utm_term=biology+notes+class+11+pdf PDF link annotation
    • http://sevisotesasare.iblogger.org/how_to_use_a_singing_machine_karaoke_machine.pdfIn PDF document text
    • http://vvd.bar/dictionary_fullnnewy.pdfIn PDF document text
    • http://pekibexuvipeve.scienceontheweb.net/jet_jj-6csx_parts.pdfIn PDF document text
    • https://jojawetoterul.weebly.com/uploads/1/3/4/4/134404105/kibasatovipoga-wagovavi-zawiduxotopepi-sijofazipa.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/67327209094.pdfIn PDF document text
    • http://figimumagoko.mygamesonline.org/25341911426.pdfIn PDF document text
    • http://znakomstva18x.site/speak_now_book31pwd.pdfIn PDF document text
    • http://jijuduli.mywebcommunity.org/dipo_rei_histria_completa.pdfIn PDF document text
    • http://freedate18.xyz/321404137400u24j.pdfIn PDF document text
    • http://bezufosaga.iblogger.org/tacos_taco_bell_menu_nutrition_facts.pdfIn PDF document text
    • http://cyberlife.store/93445780082adm4m.pdfIn PDF document text
    • https://tezefidusipenu.weebly.com/uploads/1/3/1/8/131857758/kebenad.pdfIn PDF document text
    • http://zaparipajomigi.scienceontheweb.net/microplastics_in_water_and_wastewater.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xivutunitilema.epizy.com/basic_electronics_mcq_questions_answers.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_e1af540e81d1480589d37e187c1b5d38.pdf?index=trueIn PDF document text
    • https://c5c27394-2042-4749-9b39-d1c24dcbd9f0.filesusr.com/ugd/e9b987_2d209ae0c2f94e6bbdfe79e45771075f.pdf?index=trueIn PDF document text
    • http://kibuwigukakew.epizy.com/audio_visualizer_software.pdfIn PDF document text
    • http://jimozavajel.rf.gd/ruger_lc9s_pro_9mm_review.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_off0000dd16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD16 5432 bytes
SHA-256: 8cafe0084371031e27448a921b697e92b22627d61bca0284737a96407683a155
font_01_sfnt_off0000efc4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC4 10760 bytes
SHA-256: 75ccc10e979f07d9e43ceefa4c7ce4475059376b8397bc4fe80c28524c27e9bb

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