Malicious PDF — malware analysis report

Static analysis result for SHA-256 7dc55c7fad79ab03…

MALICIOUS

PDF

76.1 KB Created: 2021-03-06 12:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: ac46bce37f196b56e6c30f07450ca600 SHA-1: c5dabc897ec8aec9487c9edc2918e0839718d457 SHA-256: 7dc55c7fad79ab0314b4f114845db00bac14cf6c5917f0922928aa6b91a8c46a
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which are SEO-optimized and point to seemingly unrelated topics, suggesting a link farm or phishing attempt. The presence of a critical heuristic firing for 'PDF_SEO_LINK_FARM' and the ML classifier flagging the PDF as malicious strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malicious redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • 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://xajibur.ru/123?utm_term=how+to+use+krups+air+fryer PDF link annotation
    • http://boribonabone.mypressonline.com/amplifi_tt_discontinued.pdfIn PDF document text
    • https://cdn.sqhk.co/fafujedajir/BUHJXha/can_you_exchange_gift_cards_for_bitcoin.pdfIn PDF document text
    • https://cdn.sqhk.co/nepozenilu/1YvjbzN/mlb_news_july_2020.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/8d12558c-ec32-40d6-809e-d9c98def741c/how_to_reset_my_samsung_refrigerator_after_a_power_outage.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b737ac37-cfa4-4f7b-9a2f-6e468b286374/56443702225.pdfIn PDF document text
    • https://c09438b0-f1cf-4ade-afa2-d322e048c450.filesusr.com/ugd/313cc6_4f73055d9f814f908f39a91e0b689ca5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8798e4cb-1fb3-4076-9bbe-419620400e9a/tribe_of_mentors_tim_ferriss_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d3ef840-de49-4407-b4f6-f7e463875875/bopabivugizanemurixet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/af4b10b7-1145-44ac-a6a6-41ed4420de37/black_ice_cream_near_me.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c9fc5a6b-45f9-49c1-a8cc-c596145b9d40/what_are_the_conflict_management_styles.pdfIn PDF document text
    • http://nukilaba.myartsonline.com/38438118553.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/246a3952-f9de-4921-8089-ed5a237a2c64/73820921795.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a638fa7-1a6f-47ee-9137-37ef9cf51d16/vebeguzitemuvamakuxuna.pdfIn PDF document text
    • https://b7e73dfe-ad35-4791-b4f7-7500f5b7882c.filesusr.com/ugd/bc79a4_90e635568add47a4a5aebc179ae122a8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7244b7d-6bf9-4ff4-a375-04986b70d601/zukipodajebabaret.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/be765472-3850-4405-a77e-4d8d43c8858a/what_does_different_color_blood_mean.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8c99f9-804f-450a-a589-4757f0f8b5a8/4776371922.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/79ab0bb6-b23b-433f-8386-92453f32c813/wimefutinibubibewawalud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b6da2d9-626e-4e4c-8cfd-983169c21c03/32273393425.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/73066ff6-e5b2-47e0-b406-67b9856766ab/76385155210.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_off0000ec79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC79 5084 bytes
SHA-256: 1be96ae60b96b3d61403861371981a9f689e20707571ab4ab30e00b75b99e0a1
font_01_sfnt_off0000fdeb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDEB 11096 bytes
SHA-256: 3b4a79b02785a2a693d45bd47982e21d2eb3a4172709fd2ea14ba07db586c7aa

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