Malicious PDF — malware analysis report

Static analysis result for SHA-256 f35b4775de733c5a…

MALICIOUS

PDF

83.6 KB Created: 2021-03-29 04:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: a46bd6ede9cfb14b72f845d80f6d397d SHA-1: 849af3a31e119d0ab1d0e0df7551d42b436a92eb SHA-256: f35b4775de733c5ab7e7f9fc92ec595092c6ece69ef8e93304068729f5489dd6
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=is+the+naplex+difficult PDF link annotation
    • https://cdn.sqhk.co/fuwegamuvev/jheSp1t/96055082307.pdfIn PDF document text
    • http://xolokeminapi.getenjoyment.net/53015685416.pdfIn PDF document text
    • http://kexolifowuj.medianewsonline.com/82827720070.pdfIn PDF document text
    • https://konozobit.weebly.com/uploads/1/3/4/4/134456152/jinuwofamatuw.pdfIn PDF document text
    • http://dufigep.scienceontheweb.net/inspirational_books_to_read_free_download.pdfIn PDF document text
    • http://hiziryigit.online/kokexaxetusaj2gu5y.pdfIn PDF document text
    • https://xisidugaboker.weebly.com/uploads/1/3/4/4/134436298/fukazuwozefupibebu.pdfIn PDF document text
    • http://gufutaca6.xyz/rilasozumec1ws1.pdfIn PDF document text
    • http://paxijivatebul.getenjoyment.net/audio_technica_at-lp120_usb_turntable_-_black.pdfIn PDF document text
    • https://cdn.sqhk.co/domonuxasi/idggjfB/3844042347.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_ef98b7f7ab7e479ca8ee5db67e989e7a.pdf?index=trueIn PDF document text
    • https://c504e2ef-f928-4e80-b5b1-fc05046f432e.filesusr.com/ugd/247f25_ab743a3909f2400db828f47768047952.pdf?index=trueIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/how_to_relax_tight_elastic.pdfIn PDF document text
    • http://jemileti.atwebpages.com/87732746723.pdfIn PDF document text
    • http://dejibokakar.onlinewebshop.net/medicinal_chemistry_mcq_book.pdfIn PDF document text
    • http://wepogevadapafa.atwebpages.com/partnership_deed_example.pdfIn PDF document text
    • http://fuwutowamig.myartsonline.com/41040588379.pdfIn PDF document text
    • https://50037ee0-0691-4a53-bdc2-b2f8f795cfa6.filesusr.com/ugd/b41a9a_f5d3954e03d249fb81e6c0ddc7d9ebb2.pdf?index=trueIn PDF document text
    • https://3edbbcf3-b5b1-446e-9630-835d38fa79e0.filesusr.com/ugd/6908d7_09f8d53558c24266b5697305abbf9188.pdf?index=trueIn PDF document text
    • https://9cf5cc10-3c2e-4e30-ae6b-73ed7beed88a.filesusr.com/ugd/5c2b46_4900687299f74074a4bef187a53555e9.pdf?index=trueIn 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_off000108d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108D9 5152 bytes
SHA-256: c149cc97e0be0327a07e428da460d3d5e79a006ec0e60d96aafb7b40fed8907c
font_01_sfnt_off00011a6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6C 11348 bytes
SHA-256: b3e7db5de3d5c5a77c8406ada17eecd051e96fe65af70138eb0be3ed22a71c43

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