Malicious PDF — malware analysis report

Static analysis result for SHA-256 494e91754f053820…

MALICIOUS

PDF

85.2 KB Created: 2021-09-21 01:15:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 26afb5f32a8f905b8415cfea92521654 SHA-1: f739a8f728f98071d1ebec583eb7c0644bd8bf92 SHA-256: 494e91754f053820e1374b6e653f8e05484913ed0ea340d9ebd4a6df3b19cb06
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

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://laborke.ru/uplcv?utm_term=one+day+at+a+time+streaming+season+4 PDF link annotation
    • https://mediaget.ru/userfiles/files/27083028964.pdfIn PDF document text
    • http://2018.letnifestiwal.pl/ckfinder/userfiles/files/xizosum.pdfIn PDF document text
    • http://petrduchek.com/files/66469436739.pdfIn PDF document text
    • http://happysmilecard.com/uploads/files/xopuwumepozumisegugexeba.pdfIn PDF document text
    • https://intelean.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ba7b6f3739---32594760753.pdfIn PDF document text
    • http://jaatkinson.com/userimages/93938560221.pdfIn PDF document text
    • http://knipia.com/userfiles/file/vodaguzajegov.pdfIn PDF document text
    • http://marketingnews.fr/images/file/xukabozu.pdfIn PDF document text
    • https://gestionarival.com/userfiles/file/42331894642.pdfIn PDF document text
    • http://vibrobreaker.com/files/files/murimelapebikibedezojubu.pdfIn PDF document text
    • http://gezond-trakteren.nl/kasteel-doornenburg-img/bestandenfile/lekotana.pdfIn PDF document text
    • http://www.premiumimport.nl/ckfinder/userfiles/files/20469333653.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/42157774009.pdfIn PDF document text
    • http://ruihuitax.com/files/file/najosufokedidugeragok.pdfIn PDF document text
    • https://lentes123.com/aym_image/files/sasawavidisiwipofesimifak.pdfIn PDF document text
    • https://vallejardin.com/wp-content/plugins/super-forms/uploads/php/files/41ebc196a66f83b2ba8f6f52b1061aa6/45312735661.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/73029173924.pdfIn PDF document text
    • http://gz-theoutfit.com/UploadFiles/FCKeditor/20210914191725.pdfIn PDF document text
    • http://zavalinka.by/var/upload/file/lunifinumugugoroluvonulon.pdfIn PDF document text
    • http://www.s4b.nl/upload/files/55285752766.pdfIn PDF document text
    • https://caraudioshop.ro/mm/file/20414448812.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/19651832151.pdfIn PDF document text
    • https://gesema.com/UserFiles/file/13128582152.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/55886780117.pdfIn PDF document text
    • http://stoewebdesign.no/userfiles/file/lovumijegemolegel.pdfIn PDF document text
    • http://tdbm.vn/upload/files/46031030395.pdfIn PDF document text
    • http://smartpaintingplus.com/userfiles/files/petegokoxaluzosigilov.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_off0000e7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7EA 10764 bytes
SHA-256: ceba9a13abca39bc41ab2abaf57ea5b57dc6a8b1fbfded7204cdb7deaeba9252
font_01_sfnt_off00010092.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10092 18016 bytes
SHA-256: 0a18236077646c4c1bbfd5c2880c8ff0fd2533784141e2898b685bfd29802f1a
font_02_sfnt_off00012ed0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12ED0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1