Malicious PDF — malware analysis report

Static analysis result for SHA-256 6742ec56b866b4ca…

MALICIOUS

PDF

94.0 KB Created: 2021-03-05 06:58:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 1f14949c890c890c9f609fccd79ac185 SHA-1: 6b26c2b409f8eb1ff1db9dac0e381fc22f1ced5e SHA-256: 6742ec56b866b4ca8b99097a8d0cad091e5e1aa019b8c61296a10a44130a79ff
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, many pointing to disposable domains and potentially malicious content, as indicated by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or a scam. The embedded URLs are the primary indicators of malicious activity, aiming to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://vilenefex.ru/123?utm_term=microsoft+exchange+2010+vs+2016 PDF link annotation
    • https://taxikifa.weebly.com/uploads/1/3/4/4/134496463/fududezov_pusufofozudiw.pdfIn PDF document text
    • http://lagulesuko.medianewsonline.com/midnight_sun_movie_trailer.pdfIn PDF document text
    • http://opssmall.space/nuxiwenijadasepewimobum8btb6.pdfIn PDF document text
    • http://vozobatenaw.mywebcommunity.org/nomudod.pdfIn PDF document text
    • http://help-copyrightservice.xyz/purudjmsd6.pdfIn PDF document text
    • http://roguvopupo.22web.org/bilagimixevigixoxukoka.pdfIn PDF document text
    • https://jakikoxu.weebly.com/uploads/1/3/1/4/131411542/xinebusorono.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/cee136dc-728c-4724-8640-956d2d875f44/que_medios_de_comunicacion_oral_hay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e3ebcf2c-1054-45b9-8e5c-3fba5383ea00/38519237457.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21c1a300-0d0d-4b46-b38e-3a45abb66039/how_to_make_xfinity_my_homepage_on_microsoft_edge.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/169f91dc-fec5-483d-9682-86c000bf13bc/53428169151.pdfIn PDF document text
    • http://ruguweronum.rf.gd/where_is_the_book_of_life_found_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7a1a141-ece8-4168-80ef-ac889c6d836b/vunimirolemanuripuraf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d770b605-d687-435a-b968-2d3eb89af30e/leadership_test_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a76b6332-8744-46e7-bf2e-9f7d32a10e95/93500511516.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6c0cbc5c-8dbc-40c9-af4e-245fc3a8d727/najawilalol.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_off00013051.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13051 5724 bytes
SHA-256: 3f047e951c9a7e3df0e0157f492e0cab621e13f2455d09ddf3989f84a2d6717c
font_01_sfnt_off000143e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143E9 11588 bytes
SHA-256: c8b51b5960341b9abd3f3434cfb983d089024b67bcf8b283a52415d344007333

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