Malicious PDF — malware analysis report

Static analysis result for SHA-256 33103cacdb08fc90…

MALICIOUS

PDF

79.3 KB Created: 2021-09-28 02:31:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 1da453ab78a1aeaf6172b7f09792c770 SHA-1: d4383b581d9856ae28eb8ea94e9e138350166f76 SHA-256: 33103cacdb08fc9097d21d8e3514a95843d7a4b7a2b1fa950572883ef718a6fa
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing or trojan variant. It contains a large number of embedded URLs pointing to various domains, suggesting a link farm or redirection mechanism to deliver malicious content. The presence of external URIs and the PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicate a deliberate attempt to obscure the final destination and potentially evade detection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://garglob.ru/uplcv?utm_term=100+best+ppsspp+games+download PDF link annotation
    • http://hainescentreasia.com/images/file/68277997977.pdfIn PDF document text
    • http://cableesmaltado.com/d/files/sibuxaxumofejobatavazod.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/47933447873.pdfIn PDF document text
    • http://kaus21.com/userData/board/file/26408260388.pdfIn PDF document text
    • http://huthamcauquanggiap.com/upload/files/repov.pdfIn PDF document text
    • http://xn--9i1b14lwsg1seumdzsx.com/upload/fckeditor/file/milosuwugajotazaroxatob.pdfIn PDF document text
    • http://alpinist.store/sribati/editor/uploadfiles/70199160048.pdfIn PDF document text
    • https://fleuriste79.fr/ckfinder/userfiles/files/ninutojogulalen.pdfIn PDF document text
    • http://lishasurgical.in/ckeditor/ckfinder/userfiles/files/xogivite.pdfIn PDF document text
    • http://safetyassessmentsolutions.co.uk/ckfinder/userfiles/files/gezelapurodigojefegobefu.pdfIn PDF document text
    • http://hflbdq.com/uploads/file/231254565049.pdfIn PDF document text
    • http://uteambio.com/upload/files/dizoninaxubexotosixisa.pdfIn PDF document text
    • http://www.benvenutialmare.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ee14e98431---noxipavejugepepigipagilat.pdfIn PDF document text
    • https://pamukoglu.com/userfiles/file/50444353776.pdfIn PDF document text
    • https://anbuadidravidarmatrimony.com/ckfinder/userfiles/files/5700626485.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/pidomosalusixexap.pdfIn PDF document text
    • http://thesnowmanicecream.com/ckfinder/userfiles/files/xutevejifefopatorusuxa.pdfIn PDF document text
    • https://www.domaine-boussard-chablis.fr/ckfinder/userfiles/files/keperetuvij.pdfIn PDF document text
    • https://cqc-material.com/app/webroot/userfiles/files/vowit.pdfIn PDF document text
    • http://damnoen.com/ckfinder/pho/files/wedimuzoxorivupa.pdfIn PDF document text
    • http://dotacjedlaoze.pl/userfiles/file/92875446309.pdfIn PDF document text
    • http://kledingindex.nl/images/uploads/63449516163.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_off0000c715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC715 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 20944 bytes
SHA-256: 69eaa6875939dcba26b2e2eec12435d76d79a9f1ccb0e451f362b8aec12b898e
font_02_sfnt_off00011587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11587 10844 bytes
SHA-256: 5e5e9d6500e01b18163574b5adfcda05c5671291b94ab36c03d770b6523b3f49

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