Malicious PDF — malware analysis report

Static analysis result for SHA-256 0400bfb327bb22cd…

MALICIOUS

PDF

82.4 KB Created: 2021-09-17 05:26:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: b08b7886fe9c4ae8dd4b3083613c4fe8 SHA-1: 7bf6342665f6d5bdddf9fa35e020e77e0f2e0c8e SHA-256: 0400bfb327bb22cdfb1586bbb9f1b660ecff497665c26550a796d6d89364bbdc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The document body is heavily obfuscated, but the presence of numerous embedded URLs suggests an attempt to redirect the user to malicious sites. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://htapigroup3.com/contents/files/xijerifukabuxezonewevaki.pdf In PDF document text
    • http://nb-magnet.com/upload/files/54336094511.pdfIn PDF document text
    • https://sarna-zapiekanki.pl/ckfinder/userfiles/files/wakomevi.pdfIn PDF document text
    • https://bykevin.com/wp-content/plugins/super-forms/uploads/php/files/f9197359c3823262c34fac7b226d0941/nosirixi.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fazakiveliwulal.pdfIn PDF document text
    • http://flirdining.com/uploads/files/42475507162.pdfIn PDF document text
    • https://sydneystudytour.com/accounting/userfiles/file/wizisadanemebedobig.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/161411f2d1726c---tifikeliwutedego.pdfIn PDF document text
    • http://babyindex.nl/images/uploads/96311927195.pdfIn PDF document text
    • https://dalilak1.com/userfiles/file/rokitaferasikaramorokesep.pdfIn PDF document text
    • http://baracenter.be/userfiles/file/vamigutin.pdfIn PDF document text
    • https://www.meditech.cz/ckfinder/userfiles/files/73277116330.pdfIn PDF document text
    • http://www.pethouse.es/ckfinder/userfiles/files/kizumevusuzam.pdfIn PDF document text
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/wubewamixafegi.pdfIn PDF document text
    • http://tg-focus.ru/userfiles/files/47052992449.pdfIn PDF document text
    • http://npi-management.org/ressource/site-image/files/35103011357.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/valemurolideruworaf.pdfIn PDF document text
    • http://dentalcenterstudio.it/userfiles/files/xozuxenulumop.pdfIn PDF document text
    • http://373113.linker.tw/files/zipodibitabadirido.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/vosuzexatobasit.pdfIn PDF document text
    • http://usa-ex.com/images/blog/file/zasozilimezimimawunolu.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/97573050614.pdfIn PDF document text
    • http://www.europesolidaire.eu/userfiles/files/78093232526.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=story+books+online+pdfPDF link annotation
    • 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_off0000dc9d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC9D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4B4 10748 bytes
SHA-256: cd61012d0256da72950a55790c787d1c31e54f0a5fa780c6495b673349c40dcb
font_02_sfnt_off00010d4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D4D 18256 bytes
SHA-256: 1946cb5d1626556529a4d2321b1bd786f54fbdc30a30017d5bfaa0019a909115

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