Malicious PDF — malware analysis report

Static analysis result for SHA-256 b00beef46045d9ab…

MALICIOUS

PDF

81.6 KB Created: 2021-09-14 08:23:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 8ac3bfd50c01ed5f6ad6b91400269aee SHA-1: 493045042ded0004acc7b80670fbaae67fc5e8ca SHA-256: b00beef46045d9abb99ac729450e691ce051987d2d512a899b750d2bc2c71f6e
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics as malicious, including a high-severity PDF_RANDOM_URL_LINK and ML_NYX_PDF_MALICIOUS. The presence of numerous external URIs, many pointing to potentially disposable domains, suggests a phishing or malware distribution attempt. The ClamAV detection further supports the malicious classification.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://inwebjor.ru/uplcv?utm_term=wwe+psp+games+download+for+android PDF link annotation
    • http://thementalhealthadvocates.org/files/userfiles/file/wexerugejiburalofogeme.pdfIn PDF document text
    • http://studiotecnicopinto.it/userfiles/files/pudexefodevasum.pdfIn PDF document text
    • https://allcreaturesinc.com/files/files/50034037869.pdfIn PDF document text
    • http://moderncarrent.com/user_img/files/19916868079.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210906164818.pdfIn PDF document text
    • http://sjhtractor.com/d/files/15663733376.pdfIn PDF document text
    • http://savytrading.com/userfiles/file/61497221582.pdfIn PDF document text
    • https://www.hotelamoha.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613d08a036626---wudagirapoki.pdfIn PDF document text
    • https://livresdarts.com/ckfinder/userfiles/files/jasowozexemujeme.pdfIn PDF document text
    • https://renhedc.com/uploads/files/202108311916058182.pdfIn PDF document text
    • http://caerulumpharma.com/upload/files/fokedinis.pdfIn PDF document text
    • https://www.traitagri-solutions-alternatives.fr/ckfinder/userfiles/files/wurosivakumadesaliz.pdfIn PDF document text
    • https://vanphongphampmc.com/upload/files/90486003956.pdfIn PDF document text
    • http://ambulatorioveterinariopisillibertozzi.eu/userfiles/files/63028295199.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/50652075372.pdfIn PDF document text
    • http://didaconcept.com/admin/fckeditor/file/zimizipipab.pdfIn PDF document text
    • http://minipit.com/data/files/45261331991.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/nemepejijasiz.pdfIn PDF document text
    • https://laps.pl/userfiles/file/mobudigifadow.pdfIn PDF document text
    • http://snailgame.ru/upload/files/20210904020008.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/metuvodoxemosifirazo.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/48894900964.pdfIn PDF document text
    • https://www.audioclinica.pt/wp-content/plugins/super-forms/uploads/php/files/upl2ccnmdd6t35cdelgg069r7g/kutixowedizusik.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_off0000da5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA5C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF273 10820 bytes
SHA-256: 6fe0a9b9467ff4c7674fed406fbcaf3f3cfb54ede13a627a6a7b9257a9c453ea
font_02_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 17756 bytes
SHA-256: 73023422b064312c80cf8098077d4c7e0f184e2216604945e15537d7ae144777