Malicious PDF — malware analysis report

Static analysis result for SHA-256 e859294c57dddf43…

MALICIOUS

PDF

84.3 KB Created: 2021-03-18 05:53:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 8a5a7defb6ffebea48e2dd1ca77131b1 SHA-1: 224b54d752904cb37ddb471dfbbad8cef0e0ff5c SHA-256: e859294c57dddf435eccd7a9ae317f4237ce3d1120cc9477094a4677b11d82db
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, with one prominent URL pointing to a suspicious domain. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. While no scripts were extracted, the structure and heuristics suggest an attempt to redirect users to potentially harmful content, aligning with phishing or SEO abuse tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=37mm+flare+launcher+beehive
    • http://bufezipuduxev.mywebcommunity.org/59540500129.pdf
    • http://vomidujoma.scienceontheweb.net/european_food_law.pdf
    • https://static.s123-cdn-static.com/uploads/4421039/normal_5ff3391ebb01f.pdf
    • http://sanasojan.22web.org/bromomethane_bromoform_chloromethane_dibromomethane.pdf
    • https://cdn-cms.f-static.net/uploads/4408478/normal_6045143bb9a31.pdf
    • http://xexapitanegis.getenjoyment.net/rukowolabufukedajuboz.pdf
    • https://cdn-cms.f-static.net/uploads/4422628/normal_6014caa329293.pdf
    • https://static.s123-cdn-static.com/uploads/4393515/normal_5ffae3b670bb0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://a1c9bafd-2917-4c1b-b79c-a4b44a941470.filesusr.com/ugd/f0f215_cb1cd8de036b40b5ac61a5ee59ec5d34.pdf?index=true
    • https://4095172d-bd2f-4181-91d7-dd424e653400.filesusr.com/ugd/df73ab_6b764c349ab64d8aa7cbebb3ea8df78e.pdf?index=true
    • https://uploads.strikinglycdn.com/files/7b75f1f5-7bcd-4a18-9e78-92636a11aeac/how_to_reset_a_swann_security_system.pdf
    • https://uploads.strikinglycdn.com/files/a7a71c65-fb1b-4de9-8a0e-e40142fe2f9e/42811352871.pdf
    • https://uploads.strikinglycdn.com/files/dedb4ea5-d305-4627-8290-4741a148bc7d/mubevavurafosu.pdf
    • http://lodafudamisov.epizy.com/probability_tree_diagrams_gcse.pdf
    • http://toxiramagelovit.epizy.com/parchment_paper_sheets_15_x_21.pdf
    • https://6998e30b-c911-4113-ab34-4c15204891c7.filesusr.com/ugd/429b25_1cda73e3d2a04963b9095e35599b7764.pdf?index=true
    • https://uploads.strikinglycdn.com/files/449173b0-e1e5-4b31-8b4c-a9413ddd75bc/excel_vba_find_partial_string_in_range.pdf
    • https://d6504552-49b0-4b7d-b1ff-94f9e1082b83.filesusr.com/ugd/1f0558_be35463db84549fc9d8decb751ad2dca.pdf?index=true
    • https://02bc4616-4eae-4b38-b2c9-0e654f754ee0.filesusr.com/ugd/069df5_6418ba5357724fe8a917684a3cbbd813.pdf?index=true
    • http://relivoziz.atwebpages.com/3522049622.pdf
    • https://uploads.strikinglycdn.com/files/4d8ca1e2-fc69-4d14-a0cd-090e793032f5/lexus_gx_460_price_in_uae_2020.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_off00010840.bin
63a35c4c6eb0b8bfb18fdf9ea9bba4f19b1ce29c053c01c7ce34b94811ef93e4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10840 5292 bytes
font_01_sfnt_off00011a29.bin
90afa046a6f82680f900b659e155e6644bb39999af937418f30f37ebc5d3887b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11A29 12364 bytes

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