Malicious PDF — malware analysis report

Static analysis result for SHA-256 511938cbae58ced3…

MALICIOUS

PDF

89.3 KB Created: 2021-06-02 05:06:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 58a6a90b6b0199c727eb43a307b0e785 SHA-1: 9f28527876a6522cf5f8f549ddf39fec063cbf02 SHA-256: 511938cbae58ced3f735844f51f26c766a97b9902771989ef3dd5380bc02bd30
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains, suggesting a link farm or phishing attempt. The primary URL, 'https://drafthe.ru/pbw?utm_term=ariens+824+snowblower+parts+diagram', is presented as a parts diagram to entice clicks. ClamAV and ML classifiers identified this file as malicious, specifically as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://drafthe.ru/pbw?utm_term=ariens+824+snowblower+parts+diagram PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4403683/normal_602ce670d7069.pdfIn PDF document text
    • https://lelunoforonu.weebly.com/uploads/1/3/1/6/131606056/3220549.pdfIn PDF document text
    • https://wetexojozow.weebly.com/uploads/1/3/0/7/130740218/bfdd0b398125843.pdfIn PDF document text
    • https://zedodunojoponex.weebly.com/uploads/1/3/6/0/136083391/8345845.pdfIn PDF document text
    • https://bokepamukabina.weebly.com/uploads/1/3/5/2/135293240/biwaroxugutapup.pdfIn PDF document text
    • https://lobusejorul.weebly.com/uploads/1/3/5/3/135338183/guvumidaduw-regajivit-jipixemuxa.pdfIn PDF document text
    • https://suponililodu.weebly.com/uploads/1/3/4/3/134322256/piwajaxunujisarof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426816/normal_6041bb2bbbdaa.pdfIn PDF document text
    • https://donabetolemi.weebly.com/uploads/1/3/1/6/131637402/kapiti.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4403543/normal_60b08e2142bda.pdfIn PDF document text
    • https://vekafikag.weebly.com/uploads/1/3/5/9/135986004/lekatujizoboweli.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4421778/normal_60b2cf5a46729.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418590/normal_6025197da632a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379362/normal_6008633486eb3.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4422909/normal_60b6b8e510d03.pdfIn PDF document text
    • https://jogelobob.weebly.com/uploads/1/3/5/9/135961552/a269afa33de6c99.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0790ffdd-9a28-4075-81f3-450449eb0f8c/othello_act_4_scene_1_questions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888c4b72-e7c2-4dfb-9c03-56b050f354ba/bibilisosalom.pdfIn PDF document text
    • http://xutosop.pbworks.com/w/file/fetch/144446598/18792906895.pdfIn PDF document text
    • http://duziruromeja.pbworks.com/f/lutipa.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144421794/51978280902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c8fe50f1-eabb-4aa7-bb86-efa1d0b514ce/sansa_clip_dac.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97b9a586-66c3-4beb-860a-22b2cc0ad9cb/best_treadmill_for_the_money_2021.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5243b4d6-c89d-4ca8-9a19-019102b68ca6/ludo_star_1_cheat_codes_for_android.pdfIn PDF document text
    • http://viluxese.pbworks.com/w/file/fetch/144427494/84676309808.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000106e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106E0 5912 bytes
SHA-256: 0754e76e33b48036540a595edf30dd08105a1d8858febd8f2a1bcd43209cfddd
font_01_sfnt_off00011b00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B00 11220 bytes
SHA-256: a5440691e13d41cfcaba5f8cd568a8bad6ace59afb4e5132a87d39323b602e10
font_02_sfnt_off00014171.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14171 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e