Malicious PDF — malware analysis report

Static analysis result for SHA-256 68bd897b6414c5cc…

MALICIOUS

PDF

70.3 KB Created: 2021-03-18 02:47:25 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-28
MD5: 185d4dabc07f83a4ec95c1fe860d5f4d SHA-1: 57f36d57e30e6f0ff85bd491f19038318179a295 SHA-256: 68bd897b6414c5ccdd0ddd31d9f42f00974106017f1ec9ab379eeb76fa6cf4cb
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a primary focus on 'seumenha.ru' and 'cdn.sqhk.co', suggesting a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for link farms, further supporting malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a lure to a malicious website.

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://seumenha.ru/award?keyword=administra%25C3%25A7%25C3%25A3o+publica+estrategia+concursos+pdf PDF link annotation
    • https://cdn.sqhk.co/tosobulig/jihdpic/79233525578.pdfIn PDF document text
    • http://towufato.mywebcommunity.org/everyones_an_author_2nd_edition_table_of_contents.pdfIn PDF document text
    • https://cdn.sqhk.co/nupozifulija/jgehiXy/9349144372.pdfIn PDF document text
    • http://gimemuwet.mypressonline.com/aashto_1993_espaol.pdfIn PDF document text
    • https://cdn.sqhk.co/wiluxuko/Sr8GjNE/xodag.pdfIn PDF document text
    • http://waranijovuv.sportsontheweb.net/mother_courage_as_a_specimen_of_epic_theatre.pdfIn PDF document text
    • http://dorulezebum.sportsontheweb.net/66086853787.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/mazanulime.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://d0a6b1b1-1773-4622-8b5e-0ab5990a7ed3.filesusr.com/ugd/b90ba1_99601fd0468b43b7aa3eeaab588e935c.pdf?index=trueIn PDF document text
    • http://wumikexenuge.epizy.com/cant_open_old_garageband_files.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cbd007ad-f6ae-4905-905f-bdfca81d6a64/jutavekuwepenix.pdfIn PDF document text
    • http://nokejufesuw.atwebpages.com/aumentaty_author.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0a0c2dd2-fd43-4ef3-9f35-11841b84d8a9/34212560924.pdfIn PDF document text
    • http://junirawikuxu.epizy.com/cx500_manual.pdfIn PDF document text
    • https://a12a05ab-6462-4855-b086-b0a2a961d6d8.filesusr.com/ugd/2c76f4_ce439394db3543f2b2edd247049fb698.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bb4fbe6-3602-44ac-8685-755272c50644/biwujukipetugirakuw.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_off0000d1ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1ED 6104 bytes
SHA-256: 12ca4777f5e2be445a07da07d4dc2b70047591a564ccb0a10963a198ad29f132
font_01_sfnt_off0000e5bb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BB 11376 bytes
SHA-256: 85069b870b3d677f98049fd8f6051f9668b454a65d505f692cad90e03f5d5c4f

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