Malicious PDF — malware analysis report

Static analysis result for SHA-256 160d17043f5024eb…

MALICIOUS

PDF

88.0 KB Created: 2021-03-19 11:57:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9fbcbca16a12c9775720164f6be138e6 SHA-1: 5907bef6242c4d95d0bf9d6775a2c1c08913da4d SHA-256: 160d17043f5024eb64abce5b4f3a8bc51a9971b70f43e4bd169edb7a9d70d121
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic suggest the document is designed to redirect users to potentially harmful sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/award?keyword=advanced+english+phonetics+and+phonology+pdf
    • http://mosebuzixat.mywebcommunity.org/waxabom.pdf
    • http://nowukusox.mypressonline.com/massey_ferguson_3545_decals.pdf
    • http://mebevevi.mywebcommunity.org/fundamentals_of_the_faith_lesson_2_answer_key.pdf
    • https://cdn.sqhk.co/luwukamuku/jibieij/9743480880.pdf
    • http://zibikudupe.mywebcommunity.org/zononivozuzo.pdf
    • http://fejukoturig.medianewsonline.com/how_to_set_sony_icf-c1.pdf
    • http://roxelejabojafe.scienceontheweb.net/23311710646.pdf
    • http://tuvivukaroj.mygamesonline.org/fun_football_games_for_5_year_olds.pdf
    • https://cdn.sqhk.co/wemofisejaf/hjbjXjd/event_tickets_plus_shortcode.pdf
    • http://badoxik.scienceontheweb.net/lalaburesexup.pdf
    • http://dipenoguzel.sportsontheweb.net/forrest_fenn_treasure_finder_lawsuit.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/5ece3e6a-aa46-4bc7-86ff-ac25ba9714a6/organic_chemistry_a_level_ocr_notes.pdf
    • https://s3.amazonaws.com/xapota/classes_of_drugs.pdf
    • https://uploads.strikinglycdn.com/files/73437d57-b3eb-4f89-88fc-8d6a51912d72/powedobozeni.pdf
    • https://uploads.strikinglycdn.com/files/2556dbdd-36bb-41ff-aaed-554e502b514e/the_big_short_netflix_australia.pdf
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_ed24015868ec47ed85bf705280c8650c.pdf?index=true
    • https://uploads.strikinglycdn.com/files/31c5b372-e0f5-4fd3-b346-d37964b5b050/24884146469.pdf
    • https://uploads.strikinglycdn.com/files/296c88d1-c7ea-4003-a695-9ad8188de90d/74195381247.pdf
    • https://e905a76e-7bc1-418c-be29-e8eda1603e86.filesusr.com/ugd/3fb32a_2edbfd8d504f45c5a06c60629bece196.pdf?index=true
    • https://s3.amazonaws.com/juzowilipi/armenia_tourist_guide.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_off00011787.bin
7432d2b9b94e8c71d1915106c77ce3dc1ea094a32961ed1b13437e24e44225f0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11787 5472 bytes
font_01_sfnt_off00012a3a.bin
8881f0080f971f406b9a194b184f43fdb669fc6e3c385caea4cdff0d0b7bfb86		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A3A 12168 bytes

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