Malicious PDF — malware analysis report

Static analysis result for SHA-256 99f80c424758e87d…

MALICIOUS

PDF

69.1 KB Created: 2021-09-26 08:02:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 76b43d4d743992ee00f20867ec1fa09f SHA-1: 129b0085fa9195b317d51862a9ad81908c534bdd SHA-256: 99f80c424758e87d9c77a553e0c70bbb5539102824fd6647deeec4bfbeb3a7f7
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as a phishing lure due to its image-only nature and embedded clickable link. The heuristic 'PDF_IMAGE_LURE' indicates a common tactic where a screenshot masquerades as a document to trick users into clicking an external URL. The presence of numerous external links, many pointing to disposable domains, further supports this assessment. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 69 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://dryoucosmeceutical.com/userfiles/files/pugamemovusen.pdf
    • https://cdmsig2.com/ckfinder/userfiles/files/25602861770.pdf
    • https://bursakaynak.net/userfiles/file/bosizunupovekikizeg.pdf
    • http://xn--elementy-zczne-kwb98g.pl/media/file/44089766971.pdf
    • http://lyzebrno.cz/userfiles/file/82827287367.pdf
    • http://www.tm-africa.com/beta/public/uploads/cms_filescms_files/jidafefalu.pdf
    • http://ckud.handysociality.com/upload/files/12940838662.pdf
    • https://angkaindaman.com/contents/files/litujapewegiwapopiviver.pdf
    • http://eoffice.erdenet.mn/asu/editor/files/38036329161.pdf
    • http://midesignvn.com/uploads/files/31229001301.pdf
    • http://yearbookplus.com/uploads/ckfinder/files/zotor.pdf
    • https://onutglen.com/caningest/images/file/25242778600.pdf
    • http://jamalcar.com/userfiles/file/muzazamirodememev.pdf
    • http://cgpharma.in/cote_dor_import/admin/ckfinder/userfiles/files/riduxegemanuzofa.pdf
    • http://tonioloclaudio.it/userfiles/files/37074351400.pdf
    • http://ryukatsu.com/userData/board/file/87517220665.pdf
    • http://kystar.net/filespath/files/20210908054520.pdf
    • http://ascensionchina.com/userfiles/file/10818907068.pdf
    • http://kxqcgs.net/filespath/files/20210912140601.pdf
    • http://canyonoaksmtg.com/~duckdi5/canyonoaksmtg.com/content/file/namikodejelaxunojikera.pdf
    • https://livredart.com/ckfinder/userfiles/files/garewinufezovaken.pdf
    • https://www.sabiamente.es/wp-content/plugins/formcraft/file-upload/server/content/files/1612ecf1ea9c81---53685366649.pdf
    • http://www.biharikft.hu/bihari-admin/ckfinder/userfiles/files/74040941183.pdf
    • https://mb-classic-service.de/userfiles/file/sipuxaletiji.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=garry%27s+mod+free+download+windows+7
    • 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_off0000b15f.bin
7f46f4626c16e178abf5581b8915460de847aa97c2b01b7bc5760562b78921b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB15F 13664 bytes
font_01_sfnt_off0000d340.bin
b29fdd71030cd93adfd4368ac5cd102855486939b4efafb3e83c7ff0a46181df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD340 10740 bytes
font_02_sfnt_off0000ec1c.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1C 16792 bytes

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