Malicious PDF — malware analysis report

Static analysis result for SHA-256 a3b7862f7377d08f…

MALICIOUS

PDF

70.7 KB Created: 2020-12-08 00:46:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 60705ed38d98ad87b34ed82cde117a7a SHA-1: 1653e662324892ea4463a48d55fc49e9a01a9e9a SHA-256: a3b7862f7377d08f8785f10e11a4a83653d796bcbddcfc65bef0bbff3c3cde8f
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses a fake browser/software-install lure. 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 0.9997

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.
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://traffset.ru/strik?utm_term=tony+tan+caktiong+story PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4447095/normal_5fa80e03d9bee.pdfIn PDF document text
    • https://melijezaziwoni.weebly.com/uploads/1/3/4/8/134851492/ropimuxitebud.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446260/normal_5fa1d106aa2b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368505/normal_5f9f716f0f570.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/xurixado/20177097523.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a8f7efca-8912-4088-9ae8-bcf2136ffa83/fnaf_world_free_gameplay_no_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7d0f3d8-0b96-46a8-be0e-6d98c8fc9bd2/trimet_lift_honored_citizen_application.pdfIn PDF document text
    • https://s3.amazonaws.com/dejolavubukugeb/nikanezufuzogiwalegefu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/662d939b-4034-446f-8eba-bd6aa3ddd936/89012263702.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/707c8dec-f93f-40c2-9c27-14819642f84b/wisezizijim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/26e16b7e-0058-4045-9104-6cd895972b9c/unite_dhabitation_plan.pdfIn PDF document text
    • https://s3.amazonaws.com/zukogi/87218591679.pdfIn PDF document text
    • https://s3.amazonaws.com/pegek/28977074669.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_off0000d7cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7CD 5048 bytes
SHA-256: 9047dcd4c0a5d7587f804ef2c7f8f603c515cd230cb4f1f9d8d170b254827a5d
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 11016 bytes
SHA-256: c434a2a53b9826fe4b89bdf01a9f89597675f325867e6270f76ec7d9845d7e25

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