Malicious PDF — malware analysis report

Static analysis result for SHA-256 45e81ce9c4cbf6c9…

MALICIOUS

PDF

66.9 KB Created: 2021-09-21 07:50:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9c74af25021e14956b288621b21ce58e SHA-1: bdb7c9406ef2f387a98208c07cc0109fe9819881 SHA-256: 45e81ce9c4cbf6c9a7dabb6eebd410c2139a0cd6e1f4250dc0e64516d9fb650a
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.001 User Execution: Malicious Link

The PDF was identified as malicious by ML classifiers and ClamAV, exhibiting characteristics of a phishing lure. It contains an image-only facade with a clickable action, typical of attempts to trick users into visiting attacker-controlled URLs. The document body is heavily obfuscated, preventing analysis of its direct content, but the presence of numerous distinct hosts and URLs suggests a link farm or redirection scheme designed to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 1 text block(s), carries a click-outward action, and is only 66 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://fruhmann-elektrotechnik.at/fulesilaka.pdf
    • http://www.dawnrotaryclub.tw/UserFiles/files/dadifozeluwomuz.pdf
    • http://benthanhsgfarm.com/images/uploads/files/bijobuwifetuxopatubim.pdf
    • http://handbook.hu/upload/page/file/75504278332.pdf
    • https://eclearusa.com/images/file/83220929440.pdf
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614214b23e4ed---juzetefibonal.pdf
    • http://tongchangkj.com/uploadfile/file///2021092014131372.pdf
    • https://larioenergy.net/uploads/file/96080378003.pdf
    • http://www.amedna.com/userfiles/files/nepilalamobidukoliwokinus.pdf
    • http://ksiclubcom.ksiclub.org/svnprojects/DHD/Source/images/files/jesudabew.pdf
    • http://kondicionery-vidnoe.ru/upload_picture/file/80667682398.pdf
    • http://ms-domino.eu/images/file/files/33460328466.pdf
    • https://www.bmo-agencement.fr/ckfinder/userfiles/files/mudifavawuno.pdf
    • http://nelly-design.ru/upload/files/salisogaredevejisosalede.pdf
    • http://timnhanhonline.com/upload/files/fipasaxupumuropeboxibox.pdf
    • http://indemo.pl/Image/files/76496346987.pdf
    • http://anadolumatbaa42.com/genelresimler/file/xifujunemowoxenogipimefun.pdf
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/gilexibagav.pdf
    • http://mprime.net/ckfinder/userfiles/files/zajezijetis.pdf
    • http://filippodelvita.com/demo/userfiles/file/goduwutefuw.pdf
    • https://sportuna.be/ckfinder/userfiles/files/15951165276.pdf
    • http://prestopc.it/upload/file/nurovipizoxujaboboruziji.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=how+to+download+a+font+on+android
    • 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_off0000ac4a.bin
dbe0ca131cc47a00a311caae0322f212e9e83278b3db2ea30d085e4f1038ccb5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAC4A 14148 bytes
font_01_sfnt_off0000cf9d.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF9D 16792 bytes
font_02_sfnt_off0000e7b4.bin
ee1a3353621bb719c049af6f0c50d22b8a97e451fe84066364489ad5d1dcb0eb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE7B4 10124 bytes

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