Malicious PDF — malware analysis report

Static analysis result for SHA-256 11a6593bdbfc157e…

MALICIOUS

PDF

79.8 KB Created: 2021-09-15 16:57:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 0c24ccab883215388fed41386b128263 SHA-1: 52e44c651270284790f178d07116dd343b41931c SHA-256: 11a6593bdbfc157e2b3f3ecd6e556ea62abff1194fdb3cec506052eac1635421
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ClamAV and an ML classifier as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting an attempt to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://krisoc.ru/uplcv?utm_term=best+app+for+offline+maps
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/28016770022.pdf
    • http://www.urbanwaterways.info/files/tedepo.pdf
    • http://www.icf-plant.com/files/file/93241199235.pdf
    • https://asiarsolutions.com/userfiles/file/72839675763.pdf
    • http://gleb777.com/fck_upload/file/ludid.pdf
    • http://csc0512.com/userfiles/file/20210907120008_4dxjaj.pdf
    • https://ozmutludokum.com/userfiles/file/74878117467.pdf
    • https://ristovski.mk/public_html/upload/userfiles/file/tezixaxosisokomit.pdf
    • https://cebrigantina.com/025-CEB/images-editor/file/wemonerifiwesofaxar.pdf
    • http://hytechcommunications.com/userfiles/file/39751862576.pdf
    • http://barsugo.com/ckfinder/userfiles/files/jegeroxanojikolavosa.pdf
    • http://fra2ange.it/userfiles/files/maxesajupozusuve.pdf
    • http://xn--80aafkatcapceshpicpg3h.xn--p1ai/pict/file/31716094818.pdf
    • http://traiteur-ribot.fr/userfiles/file/62321851510.pdf
    • http://gianniarnaudo.com/userfiles/files/89611330379.pdf
    • https://calprin.com/ckfinder/userfiles/files/juxosunimigekoxapurolefiv.pdf
    • http://tuvantindat.com/uploads/2021-09-13/images/files/77440954196.pdf
    • http://jingyilin.org/uploads/file/kumirogef.pdf
    • https://www.sharpeningfactory.com/wp-content/plugins/formcraft/file-upload/server/content/files/16136cbb496e42---dikagobejolenefadewul.pdf
    • https://nulifeus.com/~nulife/userfiles/file/zitiruxajogev.pdf
    • http://ekonopuntos.com/campannas/file/74341885261.pdf
    • http://collectifff.be/imgdb/accueil/files/mobusewisizadebu.pdf
    • https://cargoservice.pl/cargoservice/userfiles/file/zubit.pdf
    • http://imdmotors.com/uploadfile/file/2021091006244520.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6a5.bin
41c7ee0c1b9bb4606c4668ccbd25ae4abcf083bd0fb526f5a1bc8873914d3b08		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6A5 10572 bytes
font_01_sfnt_off0000eec4.bin
8dc4476d70a3f4eff7279ef3cc35881c5257f9873fa63db22d6403911c788c97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC4 16420 bytes
font_02_sfnt_off00011943.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11943 16792 bytes

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