Malicious PDF — malware analysis report

Static analysis result for SHA-256 427148ccf9977d69…

MALICIOUS

PDF

70.3 KB Created: 2021-05-13 07:49:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4e86a3bdad37ac83c4fc6b489522e4fe SHA-1: 729b4c9d6e613dcd8d5af81a5831ebfe1166394a SHA-256: 427148ccf9977d699099df0673d3f60440ceabb12dfc5efeb98b38a30a504f8e
164 Risk Score

Malware Insights

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

The PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of a PDF link farm heuristic suggests the document is designed to redirect users to numerous external URLs, potentially for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to exploit users through deceptive links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/strik?utm_term=seasons+printables+preschool
    • http://kuvenumine.mygamesonline.org/how_much_do_oncology_dietitians_make.pdf
    • http://vuvabadiredowa.getenjoyment.net/24126606229.pdf
    • https://lomapasaxanigef.weebly.com/uploads/1/3/1/1/131164081/87c999747b46d0.pdf
    • https://zutuvibob.weebly.com/uploads/1/3/1/4/131407898/subojidilav.pdf
    • https://cdn-cms.f-static.net/uploads/4423752/normal_60253569a08c0.pdf
    • https://static.s123-cdn-static.com/uploads/4491437/normal_6008278b3d798.pdf
    • https://rarejiwu.weebly.com/uploads/1/3/1/6/131606055/c42f5.pdf
    • https://moxetutatag.weebly.com/uploads/1/3/4/2/134234950/botilujikeboje.pdf
    • https://derakudo.weebly.com/uploads/1/3/4/2/134266069/neboxoja-pazopu-kibidukiro.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/919be955-f1c8-4340-8767-b938b77dc201/29284587891.pdf
    • https://uploads.strikinglycdn.com/files/dac15022-72bc-4462-b746-43bfd957245d/saviwitud.pdf
    • https://uploads.strikinglycdn.com/files/a57783d6-dd75-4163-b378-997bc8e6fa15/how_much_does_mercedes_maintenance_cost.pdf
    • https://uploads.strikinglycdn.com/files/9e9a0aa8-5e43-4fa4-bc56-9b19608f1b2a/how_to_put_on_gentle_leader_collar.pdf
    • https://uploads.strikinglycdn.com/files/b07f0645-7fc2-43a4-aea7-6c50fe19e91c/final_fantasy_xv_playstation_trophies.pdf
    • https://uploads.strikinglycdn.com/files/4eafeb00-78d8-45d9-89c1-04260198a31d/when_should_a_relationship_become_facebook_official.pdf
    • https://uploads.strikinglycdn.com/files/91e45143-6f04-4b65-88af-81f62c2377f7/debudonekofaje.pdf
    • https://uploads.strikinglycdn.com/files/a896cbfb-a6ef-4ab5-b159-c6026cd76416/gufizebijaz.pdf
    • https://uploads.strikinglycdn.com/files/d8be2bac-e319-45b4-a5e7-68f560ac713d/kofipuboduzikubuve.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d71e.bin
d33c728cae5eb433673a5f2d769d010d7d44bf55124bf5bc16ef86b4101073f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD71E 5264 bytes
font_01_sfnt_off0000e8f3.bin
3bbc493780c298ea06b41efc94613ee666c3b6355a59ec386ff2c2a728b4cee1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8F3 10160 bytes

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