Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bd1187f849fa05e…

MALICIOUS

PDF

74.2 KB Created: 2020-12-04 03:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: e3ce037017be4b846c0f91ee45c4872a SHA-1: 2dd82f76be56b031c5dbd4bf1d70539ea19fd14f SHA-256: 7bd1187f849fa05ec6dafb8fb84a3a2901d2a48d98f9ce52a902f80d16215fcc
262 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous links, including one pointing to known malicious redirector infrastructure, and exhibits characteristics of a link farm. Heuristics indicate it's a browser installation lure and a phishing attempt, likely to trick users into downloading malware disguised as an update. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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
  • 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
  • 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://cctraff.ru/aws?utm_term=android+update+lg+nexus+5 In PDF document text
    • https://cdn-cms.f-static.net/uploads/4461216/normal_5fa5b031e2bd6.pdfIn PDF document text
    • https://tokuniti.weebly.com/uploads/1/3/4/3/134331772/mijobewuludidibaw.pdfIn PDF document text
    • https://migobagola.weebly.com/uploads/1/3/4/8/134874333/9654080.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366399/normal_5f871d4a5ca76.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426957/normal_5fc878fe1dd64.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/986c874e-fd7a-44c6-aca6-a0d62e0f33f9/vifutapanibimurodanekaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67721e03-aa7c-4629-ab41-70011c7d9cc8/96054571610.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48ae62e-bcf7-471b-80d1-79fe06905733/47312472386.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a419d00-c8fd-4a8f-84cb-2a39e16cb768/gC3BCneC59Fi_beklerken_10.bC3B6lC3BCm_indir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4b1d850a-bf04-4f57-92f1-ad2c96c65a24/91188195301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f6abcf4-04ca-49dd-8abb-a22b9fee4edf/54729503970.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f81d57-7014-40e5-9c40-e81c92f8143b/bokakajogavixoruwilolew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3c53395-5f9d-4b26-a3f8-457a576df396/59224293682.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d4ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4CE 5192 bytes
SHA-256: 81451490f0d39a8d95269e95eb56359ea60ca79d9d4a5937e21a9860513dea04
font_01_sfnt_off0000e684.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE684 11696 bytes
SHA-256: 301efab90e0353bd2172e40378814513354ae869ba2d7ada82d241035e076265
font_02_sfnt_off00010e71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E71 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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