Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e3ab39e96847d58…

MALICIOUS

PDF

69.0 KB Created: 2021-05-10 04:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bbd83df98b8a5dd13e9a77ab5c55fda2 SHA-1: dcf452583444c05e2e78d252120d2e7d4635a3b3 SHA-256: 7e3ab39e96847d58b573474d5961efe4da2f71871d6f1ee0055948636ab72d47
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic firings reveal a significant number of embedded external links, suggesting a link farm or phishing campaign. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, but no clear instructions or lures. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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
  • 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://kuzutuzo.ru/strik?utm_term=what+is+heat+in+science
    • https://cdn.sqhk.co/kulukopupiw/hfiKjaa/62151114988.pdf
    • https://cdn.sqhk.co/wuvidomanale/jjXZChr/xedejetuvosoxidevifuwo.pdf
    • https://cdn-cms.f-static.net/uploads/4412588/normal_5fd7d3dd6d5f4.pdf
    • https://static.s123-cdn-static.com/uploads/4386849/normal_5fcfe943a8f52.pdf
    • https://cdn.sqhk.co/pixafosabow/bQihjcM/95706630888.pdf
    • https://cdn-cms.f-static.net/uploads/4472200/normal_6047439086061.pdf
    • https://cdn.sqhk.co/peluxisomex/aihhbgj/84015379198.pdf
    • https://cdn-cms.f-static.net/uploads/4483608/normal_6025270461f9f.pdf
    • https://cdn.sqhk.co/fuxiwimemo/fkhiOja/39245028599.pdf
    • https://cdn-cms.f-static.net/uploads/4408340/normal_5fda630020657.pdf
    • https://cdn.sqhk.co/mojesoje/NHGhf6V/71293577866.pdf
    • https://cdn.sqhk.co/feguzuvubut/djg0jSQ/sonnys_place_halloween.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://9c789f27-b70c-4c9d-9e83-211ee8f99b38.filesusr.com/ugd/bdeb4c_af743f6243a24d22b4a1c5cc0c7ac3e6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b45a850a-a553-42a5-81f8-20abf842b5f7/beats_solo_3_rose_gold_unboxing.pdf
    • https://s3.amazonaws.com/ninazarila/aphasia_workbook.pdf
    • https://uploads.strikinglycdn.com/files/29afa71e-00ed-4552-aab8-2e9a8abc68d9/hp_8600_printer_toner.pdf
    • https://c931c956-7f53-4e4e-96dc-27d7f003ba63.filesusr.com/ugd/b80c10_52d91cf8240f44d0adbbd42162714211.pdf?index=true
    • https://03df74f7-894d-4c84-999e-da2b33eb06f5.filesusr.com/ugd/4c7733_3ceec914dae44a65b14f817e76aa9fea.pdf?index=true
    • https://s3.amazonaws.com/fowikorejodi/29103780227.pdf
    • https://s3.amazonaws.com/rivazixexuguri/caldera_junkers_manual_de_instrucciones.pdf
    • https://356bbf58-84af-4bff-99a9-d03346e46411.filesusr.com/ugd/b5472a_9fccca5bfe4940d39ec27c10a7bff18c.pdf?index=true
    • https://c03439ef-6557-4199-865e-586791a52b6c.filesusr.com/ugd/6bb4a2_4cc5cff730f04c92a635512f3d40a956.pdf?index=true
    • https://s3.amazonaws.com/tevomenil/another_word_for_communication_skills_on_resume.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_off0000d230.bin
bfc9ac31cccf6ed7cea9da3c65df35d099aa634ff3cf1ed345c42ec996a2d0a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD230 4772 bytes
font_01_sfnt_off0000e279.bin
2ce3cc2b196f74ee3d7784bd513122750f8d040865b2f51cb2c1309ceef70e04		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE279 10700 bytes

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