Malicious PDF — malware analysis report

Static analysis result for SHA-256 159d9ec90dcdfe3e…

MALICIOUS

PDF

78.0 KB Created: 2021-03-14 18:21:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 83428ba6f839c216d1bf59b33f353d81 SHA-1: 48ff7f13a3690c6f4585443aa808de89fcc59bb5 SHA-256: 159d9ec90dcdfe3ec9f5320b950f0823cf4527d7d1b4b3a18fb10ab41d015188
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm or SEO abuse tactic. While no scripts were explicitly extracted, the PDF structure and link farm nature indicate a potential for malicious content delivery or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • 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://druttle.ru/wix?keyword=banana+bread+game+arena PDF link annotation
    • https://gunapozebufe.weebly.com/uploads/1/3/4/3/134316646/9742426.pdfIn PDF document text
    • https://wonomipekipi.weebly.com/uploads/1/3/4/3/134318124/bokufejirotej_subemolal_gabujo_zegozizekimi.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/gfVpohc/pixel_unknown_battlegrounds_hack_download.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/gwigPhj/suferodisatedelusamod.pdfIn PDF document text
    • http://ipatovaalena.ru/clasificacin_de_los_derechos_humanos_en_mxicoi7ivp.pdfIn PDF document text
    • http://napufokotipo.getenjoyment.net/vuzebofanime.pdfIn PDF document text
    • http://ctyr.ru/kebelejepebaglzbp3.pdfIn PDF document text
    • https://vamalemujuweput.weebly.com/uploads/1/3/4/6/134684866/adbc193e5be74.pdfIn PDF document text
    • https://jovuximunises.weebly.com/uploads/1/3/0/8/130814448/8446294.pdfIn PDF document text
    • http://good-production20.site/99716675205nq4mf.pdfIn PDF document text
    • http://tonedomopoja.scienceontheweb.net/73342613413.pdfIn PDF document text
    • https://cdn.sqhk.co/sepolulegaba/il9SihP/free_rc_glider_flight_simulator.pdfIn PDF document text
    • https://tojoniwov.weebly.com/uploads/1/3/4/6/134602819/mezolu.pdfIn PDF document text
    • https://gidelusibi.weebly.com/uploads/1/3/4/0/134040719/338b0ac9f4de29.pdfIn PDF document text
    • https://zinimejab.weebly.com/uploads/1/3/4/6/134653802/b8ed4635d2.pdfIn PDF document text
    • https://cdn.sqhk.co/gudijupimeb/iegfic3/short_word_board_quotes.pdfIn PDF document text
    • https://cdn.sqhk.co/bimolixumotu/0ichage/tunaxitoloxalexidugubit.pdfIn PDF document text
    • https://varusimutajol.weebly.com/uploads/1/3/4/5/134502614/vufira-nujilemufufut-moxurirumof.pdfIn PDF document text
    • https://pikelevadesos.weebly.com/uploads/1/3/1/3/131384679/2959725.pdfIn PDF document text
    • https://vaseviga.weebly.com/uploads/1/3/3/9/133986607/8991020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gekolutewubel.myartsonline.com/99970284566.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/epd_stock_earnings_report.pdfIn PDF document text
    • https://s3.amazonaws.com/mufukep/76645911829.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/how_to_download_adobe_premiere_pro_for_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/excel_test_for_interview_free.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_off0000f373.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF373 5124 bytes
SHA-256: 58bfb285347b2af0c95684e3a99128fddb25902695975c34a7c595fad08038b7
font_01_sfnt_off000104c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104C7 11228 bytes
SHA-256: 30f6f9e215e73c6b8882aeb68a677a73b15889f27c50d3a36a2d33bed3cbbda8