Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5eb6f23838baa6c…

MALICIOUS

PDF

79.9 KB Created: 2021-06-06 07:38:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f490723fcee0c87d27a07242b0a5f539 SHA-1: 4e24da07a0beb9615a4471ce9fd6a97ffe59b46d SHA-256: a5eb6f23838baa6c211a853b45ef7e3b326f764194cd63c2084aad8bc73cf006
156 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of a large number of external links, many pointing to PDF files hosted on file-sharing services, suggests a link farm designed to distribute malicious content. The primary URL, 'https://ketchas.ru/pbw?utm_term=asking+the+right+questions+a+guide+to+critical+thinking+12th+edition+free+download', indicates a lure related to a book download, likely to trick users into downloading further malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/pbw?utm_term=asking+the+right+questions+a+guide+to+critical+thinking+12th+edition+free+download
    • https://widufosonetorif.weebly.com/uploads/1/3/4/5/134598319/2797960.pdf
    • https://static.s123-cdn-static.com/uploads/4379483/normal_5ff566205f917.pdf
    • https://zalivibutadugaf.weebly.com/uploads/1/3/5/3/135391941/01be9.pdf
    • https://sixodajumam.weebly.com/uploads/1/3/4/3/134311071/1187525.pdf
    • https://vumopiwerelo.weebly.com/uploads/1/3/4/7/134730258/bavuwebefujelizukit.pdf
    • https://lifezubolafa.weebly.com/uploads/1/3/4/7/134715310/fa8ad37a025523.pdf
    • https://static.s123-cdn-static.com/uploads/4476582/normal_5fc7f3bbf1ba1.pdf
    • https://static.s123-cdn-static.com/uploads/4387581/normal_5fdf90aa8a9e7.pdf
    • https://subuwufokizewe.weebly.com/uploads/1/3/4/8/134854038/7f0a15fb80bc7.pdf
    • https://cdn-cms.f-static.net/uploads/4499651/normal_602fce941d0a8.pdf
    • https://nubodizigo.weebly.com/uploads/1/3/5/3/135346475/jonami_pugegojapexog.pdf
    • https://favaruzikab.weebly.com/uploads/1/3/4/8/134871436/3586252.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/59e32b3d-2978-4390-95e3-b04389577d56/44961121423.pdf
    • https://uploads.strikinglycdn.com/files/954fc300-10cb-4c7a-ac32-e61c5ba44672/72950912379.pdf
    • https://uploads.strikinglycdn.com/files/92a3e090-61ac-4bad-b465-a0d5e72011e1/example_of_misprision_of_treason.pdf
    • https://uploads.strikinglycdn.com/files/a06b1f6b-c3ef-436c-9fd3-d5c5158ca3be/95559381223.pdf
    • https://uploads.strikinglycdn.com/files/8c0c4353-fb4e-4890-8f2e-43ab553b108d/pmbok_guide_sixth_edition.pdf
    • https://uploads.strikinglycdn.com/files/1c5ea2e2-c992-4c36-aa1f-d8dd8cd57626/how_to_get_a_kyocera_printer_back_online.pdf
    • https://uploads.strikinglycdn.com/files/26f8b621-2326-4af8-bacc-822a06b2c7d3/cognitive_perspective_psychology_founder.pdf
    • https://uploads.strikinglycdn.com/files/61c89424-446f-4016-b13f-8daacb361603/best_wired_headphones_2019_under_100.pdf
    • https://uploads.strikinglycdn.com/files/dd2f3e9c-c751-42b3-89c6-e53a866f6512/how_to_sort_skyrim_mod_load_order.pdf
    • https://uploads.strikinglycdn.com/files/cb3a537e-cc3c-4897-93b5-50acb43542bf/kubugirosowo.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_off0000f972.bin
3c0338220a67648cd7d616c8e5ae844d5bf68d4859181b58a51a6d8e6059ee80		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF972 5740 bytes
font_01_sfnt_off00010d03.bin
4ea57bc0a89857e49a9e81b25a85bf9dd5282f76628f97eb17b1555e167bb45c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 10476 bytes

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