Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fb975f9de80efdf…

MALICIOUS

PDF

93.3 KB Created: 2021-09-09 22:22:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8001eb6f9aff32b74e17d8a3d0e7a747 SHA-1: c8c2d4d54d40899064e9aec0a4e462352685de47 SHA-256: 3fb975f9de80efdf1215294a214ab3cd691df68cc296168414c4000c26900c10
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous external URIs and the 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicate a strong likelihood of this document being used for phishing or to distribute further malware. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9902

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://crysiq.ru/uplcv?utm_term=call+of+duty+black+download+apk PDF link annotation
    • http://seanbittinger.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/88032467765.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613656ede9ac8---57536895827.pdfIn PDF document text
    • http://happy-land.hu/editor_up/nuzukubi.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/divabivoborawub.pdfIn PDF document text
    • http://sgd42.ru/userfiles/file/xenokilizixoxolerexisaj.pdfIn PDF document text
    • https://tonerihned.cz/userfiles/file/xolunajowisepuketololose.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/607a4c1ce438485d21d5f6f6b59b8903/96146285014.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/51246204805.pdfIn PDF document text
    • http://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/22263821449.pdfIn PDF document text
    • http://abwwilson.com/uploads/files/70833561806.pdfIn PDF document text
    • http://www.ezmoving.com/file/dewaken.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/74691881808.pdfIn PDF document text
    • http://xn--72c7caerxx0d3a9eve.com/UserFiles/File/96916504656.pdfIn PDF document text
    • http://autovoda.ru/upload/files/89825314424.pdfIn PDF document text
    • http://mobydick-band.de/fckdata/file/rarijivenaga.pdfIn PDF document text
    • http://droneducational.com/admin/userfiles/file/34480965344.pdfIn PDF document text
    • https://abhimaninteriors.com/ckfinder/userfiles/files/vobodomimutixanewa.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/61166932722.pdfIn PDF document text
    • http://qualityspices.in/ckuploads/files/52144692964.pdfIn PDF document text
    • http://clinicaveterinariasangiacomo.it/userfiles/files/74262202193.pdfIn PDF document text
    • https://soudureornementalelauziere.com/upload/editor/file/fezakisewusofobotasur.pdfIn PDF document text
    • http://artikos.pl/userfiles/file/74673367102.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/jofumakusosonazored.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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE8 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc
font_01_sfnt_off0000e3e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3E0 23996 bytes
SHA-256: af884191624112d764bc42d4ca828f72391517ae528bda53d7e800bd7ad7fa19
font_02_sfnt_off00012002.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12002 16244 bytes
SHA-256: fddcbe21bdf9fb2753729b4ab5b26d7a3fbb01e3fe51d41ab0725360e25c189d
font_03_sfnt_off000135f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135F0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00014e07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14E07 10684 bytes
SHA-256: 0bc6c3bfa295f5a13b01b96c6d1df9855116a1214c110621c6271f08bc517801