Malicious PDF — malware analysis report

Static analysis result for SHA-256 6a08d8ce3606c606…

MALICIOUS

PDF

85.2 KB Created: 2021-09-19 23:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 09c45accccd4a15c263bc11197e43fd0 SHA-1: 7d95d410bfe63216bb516fe5b7ecbcdea9553266 SHA-256: 6a08d8ce3606c606f1777d09ad13b7c49c06be9455adf01479545344810f8b56
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, many of which are hosted on disposable domains or are part of link farms, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://smidgel.ru/uplcv?utm_term=the+breathe+2 PDF link annotation
    • https://peoplesmodelinternational.com/ckfinder/userfiles/files/sesinarojoma.pdfIn PDF document text
    • http://mnogonomerov.ru/uploads/file/86916347670.pdfIn PDF document text
    • https://www.bussmann-tiefbau.de/ckfinder/userfiles/files/27521129234.pdfIn PDF document text
    • https://bc2000.order-pro.com/ckfinder/userfiles/files/11484109124.pdfIn PDF document text
    • http://ipllaser.in/uploads/fusixabozupotisutadeju.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/busadunusaxavalorubo.pdfIn PDF document text
    • https://www.fyna.com.au/application/third_party/ckfinder/userfiles/files/68901716599.pdfIn PDF document text
    • https://ever-progress.com/upload/files/dilag.pdfIn PDF document text
    • http://lotusromeo.fr/app/webroot/files/userfiles/files/vukoli.pdfIn PDF document text
    • https://cafesca.info/ckfinder/userfiles/files/63020247535.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613e6914dc299---9046237366.pdfIn PDF document text
    • https://f27szerviz.hu/upload/files/waliwosejalo.pdfIn PDF document text
    • http://cs-golfclub.com/ckupload/files/litolifuref.pdfIn PDF document text
    • http://abcgsgeds.friendship-match.com/upload/files/33412443867.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/bomesominonewuvixulitas.pdfIn PDF document text
    • http://iproperty.ae/userfiles/file/jaxiv.pdfIn PDF document text
    • http://flexinform.com/hirlevel/file/1085082352.pdfIn PDF document text
    • https://cingenito.ca/upload/editor/file/wugozutilase.pdfIn PDF document text
    • http://hwayinn.com/image/files/20210903_105506.pdfIn PDF document text
    • http://przedszkolenisko.pl/userfiles/file/64963679795.pdfIn PDF document text
    • https://cualuoihoanmy.com/uploads/userfiles/file/xisebabi.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202109131702305109.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/nowifaforawolan.pdfIn PDF document text
    • https://absoluteanytime.com/media_file/files/files/8618032881.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_off0000ea63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA63 18116 bytes
SHA-256: 158326769751cbb445e583c5328bd2875055f9238fcd73f345b010da79e9fdb7
font_01_sfnt_off0001195e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13174 9900 bytes
SHA-256: 466570cff3ef12eeb9fee353b98f5c7de0c05b8fa6d3903c9883f6115a5adbaf