Malicious PDF — malware analysis report

Static analysis result for SHA-256 39ef19d586d6dccf…

MALICIOUS

PDF

83.4 KB Created: 2021-03-21 22:24:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 7f24629d658bfe570a5f8ef865708552 SHA-1: 8ee499861a51aa1f23461a52e3f36cba726c0293 SHA-256: 39ef19d586d6dccf7116b0a7c76b46fd105a7e4a1132d1aaf21db379631ce50a
196 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, and exhibits characteristics of an advance-fee scam. It contains a large number of external links, with one suspicious URL pointing to soxebez.ru, suggesting a potential phishing or malware distribution attempt. The document body is heavily obfuscated, but the presence of PDF_SEO_LINK_FARM heuristic indicates a mass of external links, likely to manipulate search engine results or host malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Advance-fee lottery/parcel scam lure high SE_ADVANCE_FEE_SCAM_LURE
    Document contains lottery/beneficiary or prize language together with large-value draft/funds wording and parcel/courier delivery requirements. This is a classic advance-fee fraud document shape.
  • 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://soxebez.ru/award?keyword=white+collar+crime+definition+pdf
    • https://static.s123-cdn-static.com/uploads/4403824/normal_6003e6f0c7562.pdf
    • http://tejidirexe.mywebcommunity.org/47161295227.pdf
    • https://cdn-cms.f-static.net/uploads/4452398/normal_6041cf9d5083a.pdf
    • http://zodimasar.mypressonline.com/precalculus_textbook.pdf
    • http://copyrighthelpptteam.com/purozivilumpl1j.pdf
    • https://static.s123-cdn-static.com/uploads/4369514/normal_5ff86edc19388.pdf
    • http://wonder-ita.space/vewuvulovijoulm.pdf
    • https://cdn-cms.f-static.net/uploads/4527108/normal_604ede419b3f8.pdf
    • http://zimezobot.getenjoyment.net/wodelojonabolujasosoz.pdf
    • https://static.s123-cdn-static.com/uploads/4385634/normal_5fc979759f9d3.pdf
    • http://trysucre.pro/how_do_you_label_circumference_of_a_circle_with_diametergaj3i.pdf
    • https://static.s123-cdn-static.com/uploads/4495997/normal_5ffa2003f14af.pdf
    • http://milanbeach.fun/is_jbl_xtreme_waterproofv0b12.pdf
    • https://cdn-cms.f-static.net/uploads/4446494/normal_6021d44830a17.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/2cb96c42-5e04-4c74-a2e8-745a35b56156/93412914756.pdf
    • https://uploads.strikinglycdn.com/files/9ca6dbdc-19a8-4569-8df9-3bfc65b44a7d/sorry_not_sorry_naya_rivera_audiobook.pdf
    • https://uploads.strikinglycdn.com/files/f8fc091a-9f5b-49bd-8259-55f746c13aab/dojesabiwivo.pdf
    • https://981168d4-05fc-44b6-871d-73371d7e8cf1.filesusr.com/ugd/87d215_64a466c5ed1644b79529cafdb5dc1bf8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5a37e014-460c-4a02-ac73-00e686b08759/is_logitech_k360_unifying.pdf
    • https://uploads.strikinglycdn.com/files/3abda208-5a16-4cba-b9d8-fce8be7a8bc9/naxirom.pdf
    • https://c809e8a6-5bdf-489d-8d8c-df4e4638a115.filesusr.com/ugd/45a296_64ceb6c01e4346ea9f2dbc8a1c529847.pdf?index=true
    • https://2b01876c-5741-4e94-bfb6-30973e4a6517.filesusr.com/ugd/45d688_c47268fd83b44a519c3aca488a29f932.pdf?index=true
    • 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_off0001088c.bin
30877f9a4201d8d4311b8585f58ab38744f8f7eddff35b1062f43b73861d3031		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1088C 5228 bytes
font_01_sfnt_off00011a3d.bin
abdcb1bedd45e3b789193b8e3f0eb291bfa79c30f19329e22197c9a677479743		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A3D 11068 bytes

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