Malicious PDF — malware analysis report

Static analysis result for SHA-256 61d11aed672bfdb3…

MALICIOUS

PDF

74.5 KB Created: 2021-02-20 19:48:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: ee68e9e3d569d76bc485fae809cce732 SHA-1: a35a6a8ab784a17d36053f59846514beb954adfc SHA-256: 61d11aed672bfdb354022dabe8ab06123fc81998c9b062850b9b0dc8d613c51f
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, indicating it functions as a link farm. Heuristics like 'PDF_SEO_DISPOSABLE_LINK_FARM' and 'ML_NYX_PDF_MALICIOUS' strongly suggest malicious intent, likely for phishing or distributing further malware. The ClamAV detection further confirms its malicious nature. No scripts were extracted, but the primary attack pattern involves redirecting users through a multitude of external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=gun+hill+home+depot PDF link annotation
    • http://academic-club.ru/antivirus_remover_app4ogxg.pdfIn PDF document text
    • https://jinikegubu.weebly.com/uploads/1/3/4/8/134873825/1029179.pdfIn PDF document text
    • https://cdn.sqhk.co/zifuvifiweva/jcjjBf6/lisa_dentist_majorda.pdfIn PDF document text
    • http://xeeewq.xyz/easy_pumpkin_carving_face_templates7lalg.pdfIn PDF document text
    • http://copyrightprivacy.site/how_to_connect_uniden_phone_to_baseny9y6.pdfIn PDF document text
    • https://fazugiwe.weebly.com/uploads/1/3/4/0/134012697/617537ce85044.pdfIn PDF document text
    • https://cdn.sqhk.co/wikaraxixi/B0ihjcO/57931676883.pdfIn PDF document text
    • https://merotulup.weebly.com/uploads/1/3/4/0/134000288/6845285.pdfIn PDF document text
    • http://frontend-developer-azaynullin.site/20524622290jhbq0.pdfIn PDF document text
    • https://votoliju.weebly.com/uploads/1/3/1/4/131453024/6446137.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://makuwuwamev.rf.gd/transformers_the_last_knight_autobot_sqweeks_rc.pdfIn PDF document text
    • http://xefesogojodegu.epizy.com/lagu_bogoh_kasaha_karaoke.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/kuwifajuzufesuvedogo.pdfIn PDF document text
    • https://s3.amazonaws.com/fajeloninesitel/context_clues_worksheets_for_third_grade.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_off0000e8cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8CB 4744 bytes
SHA-256: 33104f763666ed39025371babf270e505173b6c704850cb7d794a6a879020d31
font_01_sfnt_off0000f8c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8C9 10644 bytes
SHA-256: cc068a80ee7db1eacc02cc4ba342e1dcd5ab89d409f394ca29236edbeb559f70

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