Malicious PDF — malware analysis report

Static analysis result for SHA-256 96acc20382c218dd…

MALICIOUS

PDF

72.9 KB Created: 2021-03-22 18:23:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: aeb5bc309f3ee3c7a36fa07acbc0803e SHA-1: deb836c592c384931973adad36c49881f16e1be2 SHA-256: 96acc20382c218dd9bf054938cfd5904d03b9048ae4767146ad73d936238cc46
186 Risk Score

Malware Insights

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

This PDF document is identified as malicious by multiple heuristics and a machine learning classifier. It functions as a link farm, directing users to numerous external URLs, many hosted on disposable domains. The primary purpose appears to be phishing or redirecting users to potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. No scripts were extracted, but the embedded URLs are the main indicators of malicious activity.

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://resalured.ru/123?utm_term=amt+f%25C3%25BCr+informationstechnik+schleswig-+holstein PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465908/normal_6056f0743633f.pdfIn PDF document text
    • https://xutesinazered.weebly.com/uploads/1/3/4/5/134529246/walogetalopa_kopobete_meliwera_sogalurusafe.pdfIn PDF document text
    • https://sukorason.weebly.com/uploads/1/3/4/5/134578332/monegegiwugajiwar.pdfIn PDF document text
    • https://pakotoroxup.weebly.com/uploads/1/3/0/8/130815058/6684948.pdfIn PDF document text
    • https://batigagonu.weebly.com/uploads/1/3/4/7/134774980/makep.pdfIn PDF document text
    • https://ximabetewu.weebly.com/uploads/1/3/1/3/131384229/9c1ffb02b02c2bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_604db8db8576e.pdfIn PDF document text
    • https://bomaripuxizidul.weebly.com/uploads/1/3/4/9/134901287/xuvifibozirimuneto.pdfIn PDF document text
    • https://cdn.sqhk.co/kuwusemob/Cnjdbf2/international_marketing_notes.pdfIn PDF document text
    • https://cdn.sqhk.co/zupodejadofe/UYK5IhT/hay_day_hack_unlimited_diamonds_coins_online_generator.pdfIn PDF document text
    • https://vatipasa.weebly.com/uploads/1/3/0/7/130775610/5499d597e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_9d22446144234eb5b7c16a7fe933201a.pdf?index=trueIn PDF document text
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_eec81198c83e44de90c9c0a83fa04ef7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vawoginele/yaseen_sharif_book.pdfIn PDF document text
    • https://fa53e508-d88d-41cb-897c-7a5b6f1bfcc3.filesusr.com/ugd/361045_8615dbc1e28f414d8df556e6068daaff.pdf?index=trueIn PDF document text
    • https://ec560393-4650-4708-bf0c-d08fceb8458c.filesusr.com/ugd/ca69db_dfd15e605e9946e98bd48c5ceabe1afa.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/vintage_tappan_gas_stove_knobs.pdfIn PDF document text
    • https://s3.amazonaws.com/remavuj/faure_pavane_piano_sheet_music.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_off0000dafc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFC 5592 bytes
SHA-256: a248c54c584a40fd957089f6d4f06e6dd4abd95d188b3c49fab44f6265f93ec1
font_01_sfnt_off0000edbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBD 11520 bytes
SHA-256: 5546c0e790433ad0141d3dbc3e23f9ef09aa4aff22e5140b3d5218964892e9d3