Malicious PDF — malware analysis report

Static analysis result for SHA-256 83b7ac94de8e98ea…

MALICIOUS

PDF

73.2 KB Created: 2021-09-18 21:18:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: d46ec82254fa924ac2b303e4fdf771f0 SHA-1: 2ceedb49a27e8c9f72912ffdee3ac51cb38d9de1 SHA-256: 83b7ac94de8e98ea5381ae6bc1cd94250444bef0667e028882b8745686bff5b0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic analysis revealed numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the presence of many external links suggests a redirection or download scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://www.miyadenthai.com/image/upload/File/sepiporikew.pdf In PDF document text
    • https://ystechpro.com/nbloom/fckuploads/file/sisisazumisewiporomeled.pdfIn PDF document text
    • http://valentine.tutaylamhet.com/storage/ckfinder/files/ziperuwavaleko.pdfIn PDF document text
    • https://tennis94.fr/img/pics/files/56966054764.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210910_065327.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/82e3953a393f784c086bb438fb653da2/42669604779.pdfIn PDF document text
    • https://deniz-sogutma.org/img/userfiles/file/vofaboxotefozojub.pdfIn PDF document text
    • https://gfwofficial.com/ck_imgs/files/datulotoxitufupitubige.pdfIn PDF document text
    • http://ydyb.com/filespath/files/20210918192257.pdfIn PDF document text
    • http://sky1981.com/asset/uploads/files/88733795706.pdfIn PDF document text
    • http://pes.edu.mn/ckfinder/userfiles/files/bitagiwaxalime.pdfIn PDF document text
    • https://poganyvolgyi.hu/userfiles/file/49771691827.pdfIn PDF document text
    • http://pereplanirovkaoblast.ru/pict/file/tizekezakezofirolalibibo.pdfIn PDF document text
    • http://cutskytools.com/d/files/tidepaxa.pdfIn PDF document text
    • https://open-call.fr/uploaded/files/35644805481.pdfIn PDF document text
    • https://dollarplus98.com/images/upload/files/56962836176.pdfIn PDF document text
    • http://vivo-mebel.ru/upload/file/pikosatisajojojogagi.pdfIn PDF document text
    • https://husvagnsexpo.se/wp-content/plugins/formcraft/file-upload/server/content/files/1614436dd1f56b---57033675723.pdfIn PDF document text
    • https://all-stage-meditation.tw/uploads/files/61403244ce075.pdfIn PDF document text
    • https://vasantviharproperties.com/userfiles/file/44578182305.pdfIn PDF document text
    • http://bukharajohnscreek.com/sites/default/files/file/zonulosekixeluxex.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/28002967586.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/DOqCt-cVA4I/uplcv?utm_term=bajrangi+bhaijaan+full+movie+free+onlinePDF 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_off0000ba12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d224.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD224 16944 bytes
SHA-256: 526d1f1c85cf0f3dda147a19c6a6854d2576c8f366a76168e12fc6a4118a4be0
font_02_sfnt_off0000fdf9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDF9 10884 bytes
SHA-256: 6000fbc6d77bbd4303c30616375a13e83bd8aec63934a80c4b5b51267fa720f5