Malicious PDF — malware analysis report

Static analysis result for SHA-256 86b6d3dc3eca2c58…

MALICIOUS

PDF

69.1 KB Created: 2021-10-01 19:34:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: eb4720648e1c3be0f6b6c230cc537009 SHA-1: 445fa69ea24b257e025bc2d460ca8ac826cda5ec SHA-256: 86b6d3dc3eca2c58e2e68df9f969d39e9039c585bf1acc1c04f8b4fba5bbb7c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution campaign. The presence of external URIs and the ML classification strongly support a malicious attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://pixomot.ru/uplcv?utm_term=android+asset+studio+icon+generator PDF link annotation
    • https://pierreseche.fr/userfiles/file/19384752646.pdfIn PDF document text
    • https://vayamcs.com/content_files/files/xujapinobonalowo.pdfIn PDF document text
    • http://holidayservicemarsala.it/userfiles/files/16006854062.pdfIn PDF document text
    • http://bachtungcompany.com/upload/files/56320360130.pdfIn PDF document text
    • http://bluebossa.pl/files/file/19027057264.pdfIn PDF document text
    • http://csaladiegyteruautok.hu/userfiles/files/85646353295.pdfIn PDF document text
    • http://frigotechreina.com/userfiles/files/vizujosixesurobudetub.pdfIn PDF document text
    • https://www.ftha.org/admin/ckfinder/userfiles/files/ropiloxuw.pdfIn PDF document text
    • https://unitedfightalliance.jordanadams.com/ckfinder/userfiles/files/pukidasodelaguwewupimo.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/modolodedo.pdfIn PDF document text
    • https://trexanh.net/upload/files/25578219952.pdfIn PDF document text
    • http://files.ibiza-ferien.de/file/tavobowikag.pdfIn PDF document text
    • http://alexlunacoach.com/img/editor/file/darazifiturerivojutoje.pdfIn PDF document text
    • https://civilkontroll.hu/uploads/file/44079361662.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/12410423890.pdfIn PDF document text
    • http://olympicburger1988.com/uploads/files/92495832598.pdfIn PDF document text
    • http://hairfibers24.com/upload/file/fedozawefa.pdfIn PDF document text
    • http://lnimeina.it/userfiles/files/30993386013.pdfIn PDF document text
    • https://leanuslab.com/UserFiles/file/xefubasasewaxefe.pdfIn PDF document text
    • http://childconnect.com/swi/fckfiles/file/53235817239.pdfIn PDF document text
    • http://ciskmv.com/css/file/gavodulivojukabugivenuxo.pdfIn PDF document text
    • http://www.rosabrockenhaus.ch/ckfinder/userfiles/files/duvixasupokazivejap.pdfIn PDF document text
    • https://shevtsov-art.com/uploads/files/dizegugexizisokuvu.pdfIn PDF document text
    • http://ticaproduce.com/ckfinder/userfiles/files/mapimamef.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b153.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB153 10580 bytes
SHA-256: 1af5d5232430ebc3410984d6b143106f766890f0fa8a22721630ba1fbd4b0fbb
font_01_sfnt_off0000c967.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC967 14724 bytes
SHA-256: 09d6962abdabe23502028dda7d9b934d6fa0a92fc39ffef6f8b1b02003f88a8a
font_02_sfnt_off0000ee8b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE8B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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