Malicious PDF — malware analysis report

Static analysis result for SHA-256 bddf99effadc3e8c…

MALICIOUS

PDF

69.2 KB Created: 2021-09-21 16:49:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 8c01fe8295d699b0d4bb94fb051e7c36 SHA-1: b04718c6021f50f8815c82988cc47459c09ef6aa SHA-256: bddf99effadc3e8c09527ee01d71a43ae5e3bfce2a4f611084783f403b87a8cb
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, a common tactic for phishing or malware delivery. It contains numerous embedded URLs pointing to potentially malicious content, with one URL being `https://wastran.ru/uplcv?utm_term=como+agua+para+chocolate+book+pdf`. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to a phishing campaign or a downloader.

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 https://wastran.ru/uplcv?utm_term=como+agua+para+chocolate+book+pdf
    • http://logo4you.dk/userfiles/file/ronituzuxirafetoxipevaboj.pdf
    • http://tiyuchangdi.com/upload_files/files/20210921_051821.pdf
    • https://tese.in/ckfinder/userfiles/files/vazinoxuvesot.pdf
    • http://viviapalermo.com/userfiles/files/97125379336.pdf
    • http://findusafranchise.com/files/files/pibulodadozekunuk.pdf
    • https://faceless.me/userfiles/files/45574961569.pdf
    • https://seikai.jp/free_images/files/junowubovisikiweburof.pdf
    • http://kukubara.com/zdjecia/file/tekiz.pdf
    • http://easyreturn.store/userfiles/file/1015630518.pdf
    • http://thewesternmist.com/userfiles/file/vegebo.pdf
    • http://hnspkjx.com/d/files/19426745476.pdf
    • https://honghow.com/ckfinder/userfiles/files/14548663245.pdf
    • https://magnanelli.com/userfiles/file/65829556454.pdf
    • https://smartmedia.ro/app/webroot/files/userfiles/files/patagowutafopili.pdf
    • http://partiaweb.com/upload/files/tenevebawezuf.pdf
    • http://aatmicscience.org/asuserfiles/file/7966720024.pdf
    • https://refundsrefunds.com/wp-content/plugins/formcraft/file-upload/server/content/files/161481d5e76c16---92766531880.pdf
    • http://cn-biyoute.com/d/files/24514586393.pdf
    • http://jogagongu.pl/userfiles/file/59947790406.pdf
    • http://techcessgroups.com/userfiles/file/menoxejabevolowasamamedo.pdf
    • https://www.greenlakecruises.com/ckfinder/userfiles/files/fulosotagutigazepomozokab.pdf
    • http://www.boldino-hotel.com/ckfinder/userfiles/files/42439719765.pdf
    • http://smartraoptics.com/fck_filemanager_upload/file/57056222395.pdf
    • http://www.chinahkcarplate.com/wp-content/plugins/formcraft/file-upload/server/content/files/16138f9bf1d6a7---pelevezifitinikofilibu.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_off0000b2a8.bin
b4c5f4a2f71a3b4f6821f58eaaa2548f505492b17ad8244561dcb01b80f5a0ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB2A8 14072 bytes
font_01_sfnt_off0000d530.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD530 16792 bytes
font_02_sfnt_off0000ed47.bin
1c0bef0b809bba5e48f831a659632e3066f9bc41b9b67ab8c1a0ad9c50c2ada7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED47 11064 bytes

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