Malicious PDF — malware analysis report

Static analysis result for SHA-256 e531730207d6fb7a…

MALICIOUS

PDF

67.8 KB Created: 2021-03-24 00:59:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 46bc9050ac1aac1432560af127e88b00 SHA-1: 4071ecd7081cf31986da4282e11c4c370137b90c SHA-256: e531730207d6fb7ab41ccfc7c308c2ff55e6ce8e44da102df047d86da9c79e77
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a suspicious domain ('golowaki.ru') that appears to be part of a link farm. The document body, though heavily obfuscated, suggests a lure related to 'fireplace replacement parts', likely a pretext to drive traffic to the malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://golowaki.ru/strik?utm_term=twin+star+fireplace+replacement+parts PDF link annotation
    • http://gevenukodujojov.getenjoyment.net/wurekupedokifotasekefo.pdfIn PDF document text
    • http://gepokupaburorew.mywebcommunity.org/astronomy_bangla_book.pdfIn PDF document text
    • http://sejerodetupumil.medianewsonline.com/49742771310.pdfIn PDF document text
    • http://sepukolobu.sportsontheweb.net/22496292791.pdfIn PDF document text
    • http://difipalilif.scienceontheweb.net/waletorexip.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/58dbae20-9888-4afc-88d7-cadf6f6dfce6/kibapalegef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60db2b68-748b-45e7-b466-f6c644d31b2e/4353632991.pdfIn PDF document text
    • http://sisufovofow.atwebpages.com/html_to_jquery_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1c6fda6-f99e-4c50-b98b-bdd91aab329a/zadexulexuk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a97a393-3b34-4d01-98fa-ac659ba76135/costco_spiral_ham_cooking_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67b61c51-a6cd-454c-a4a1-040ecc89d8a7/sebozilawixib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cac6c355-2870-4943-98d7-0476b7e9a80e/leropipo.pdfIn PDF document text
    • http://kabuzore.atwebpages.com/building_drawing_mcq.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/impulse_response_files.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/834a4feb-cfd8-44a6-9568-42ba9db1d281/95301192963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f46fd0db-728e-4d4b-8fd3-702e729df79a/66861940681.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/686d76d8-45ff-4525-99f2-7fa9b9a75ffe/evh_5150_iii_lbx_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/begijufadi/autopsy_forensic_browser_windows.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5e6998f-be29-4e89-83bd-147af9e5dd1b/twilight_breaking_dawn_part_1_movie_download_in_tamil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6ad1938-4c0a-4427-97a0-e10c26dee41f/78375599880.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_off0000ceed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEED 5200 bytes
SHA-256: f612ebbb46758a10f21f88ba5cb9afd77dba88f27e419345e7e432ac1dc9240d
font_01_sfnt_off0000e09d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE09D 9768 bytes
SHA-256: 830e52032745fda76e3bbbde39775e3506db0953afb4944867a112fd2d9f357b

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