Malicious PDF — malware analysis report

Static analysis result for SHA-256 e466d01de2be4729…

MALICIOUS

PDF

71.9 KB Created: 2020-12-24 02:04:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 7d77d187f59d41acc8f2ba85fa126f03 SHA-1: ebcea2f073d20e065ffcc1d2970039e3b76ee1f2 SHA-256: e466d01de2be4729d334725e0bcabe4783e0691b7c52827657cfadfca886ee36
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF that has been flagged by multiple heuristics as malicious, including a critical finding for linking to known malicious redirector infrastructure. The PDF contains a mass of external links, suggesting a link farm or redirection tactic. The ML classifier and ClamAV detection further support its malicious nature, indicating it likely serves as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://ggtraff.ru/123?utm_term=fort+mojave+indian+tribe+covid+19 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4461205/normal_5fceb91d038d8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385206/normal_5fc981307c014.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482623/normal_5fb6ca8c3d300.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382949/normal_5fb2cf0eb1af1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479923/normal_5fd7c13cefee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384144/normal_5f92faf3d0bb6.pdfIn PDF document text
    • https://nopeludaseji.weebly.com/uploads/1/3/3/9/133986928/suwolabovak_zisagelep_jebamofefox_sabenip.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/sabegokek/acuity_golf_clubs_youth.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d39f9386-7be7-45f1-879e-de10da4dbfd3/49083346929.pdfIn PDF document text
    • https://s3.amazonaws.com/zusevamasor/suede_platform_heels_with_ankle_strap.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f78276ff-497e-44da-a7c1-eb9fbb22588d/manchester_city_hall_mo.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_off0000db23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB23 5316 bytes
SHA-256: 9a3ac0a502e4291b73034f1dfe5a5d77680fd3b046b9061c38d566695914a136
font_01_sfnt_off0000ed2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED2B 11004 bytes
SHA-256: 630ee0bbcb4fbd812cf53c35f64d4d29f4454a13d41fb2d6c9f509dabe064ca1

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