Malicious PDF — malware analysis report

Static analysis result for SHA-256 f67a0fc5b3db5e82…

MALICIOUS

PDF

77.4 KB Created: 2021-09-12 21:30:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 4aebd4fdf4a21c235e8cf387f49f3029 SHA-1: cf77d981e94dad7d63141eb310b030c45d6bf7f4 SHA-256: f67a0fc5b3db5e820dcb5c71b2a39232a268c7a4f973fc77de81bf6f0be28172
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external sites, many of which are structured to appear as document downloads. Heuristics indicate this is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also strongly flagged it as malicious. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://vuatoyen.com/uploads/userfiles/file/jizosu.pdf In PDF document text
    • http://dui-antidote.net/images/userfiles/file/sapixafubi.pdfIn PDF document text
    • http://helderlive.nl/ckfinder/userfiles/files/58892087254.pdfIn PDF document text
    • https://tahitotfaluovodak.hu/ckfinder/userfiles/files/wadewabenenikurafuxejoge.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/dilotar.pdfIn PDF document text
    • http://philipwillettelaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/galuwarureravonedip.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/1790063510.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/56848465885.pdfIn PDF document text
    • https://responsible-tourism-alliance.com/content_file/files/gefosejasoxokawi.pdfIn PDF document text
    • https://www.taxiserviceh24.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613789d73a257---xagaxozopegix.pdfIn PDF document text
    • https://phu-komplex.pl/pliki/file/bowegusupanipitonegox.pdfIn PDF document text
    • http://hantechwelding.com/userfiles/file/2021090821252273499.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/wujibovetoge.pdfIn PDF document text
    • http://gloria-eurex.com/images/blog/file/vinuxatasujufekizixoz.pdfIn PDF document text
    • https://aalatour.com/basefile/b2caalatourcom/files/xusorowujozukatusixawin.pdfIn PDF document text
    • https://aspit.ro/imagini_ws/92794845902.pdfIn PDF document text
    • https://sanghvicranes.com/staging/media/xakekuzusax.pdfIn PDF document text
    • https://horacebatten.com/ckfinder/userfiles/files/28131587486.pdfIn PDF document text
    • http://dkind.net/userData/board/file/20386909591.pdfIn PDF document text
    • http://cppzone.ru/users/blogs/file/xumoxuza.pdfIn PDF document text
    • http://theorientgarden.iorderfoods.com/uploads/files/xiduwipaneleloxofusuke.pdfIn PDF document text
    • https://dm288.rs/slicice/file/xonirevex.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=android+fake+wifi+connectionPDF 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_off0000ca26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA26 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE238 17936 bytes
SHA-256: a9ca71ae0f67cc05b96b07d175e21136339c2d53b157f54d2383953e49220400
font_02_sfnt_off00011094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11094 10412 bytes
SHA-256: 174c7c867bc8254104e4349fe52752e81bea68fb040e15e9c35bdc1119c3fd43

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