Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e1df8152108f14e…

MALICIOUS

PDF

68.5 KB Created: 2021-09-30 13:44:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: f19577d16c1ec0fd783d1d4a1708bcf9 SHA-1: 129969c018cdc9ae4c4b64d8cf4e7648c2b25c38 SHA-256: 7e1df8152108f14e0a0f32f3a0206a43730daf5a863718ffa4c4fcfba09b62b1
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF is identified as an image-only lure, typical of phishing campaigns, with a high ML score and ClamAV detection confirming malicious intent. It contains numerous external URIs, including one pointing to 'nomylo.ru', suggesting it's part of a link farm designed to redirect users. While no scripts were explicitly extracted, the PDF structure and heuristic firings indicate it's designed to exploit user interaction, likely leading to a malicious download or phishing page.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 0 text block(s), carries a click-outward action, and is only 68 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://nomylo.ru/uplcv?utm_term=good+strategy+games+android
    • https://gencshoworganizasyon.com/upload/ckfinder/files/86460539195.pdf
    • https://enilubricant.hoakhanh.vn/uploads/image/files/jolevuvinabuk.pdf
    • http://roocenter.ru/upload/file/61314072491.pdf
    • http://postelezmasivu-liberec.cz/ckfinder/userfiles/files/54528375922.pdf
    • https://bisleri.genefied.co/ckfinder/userfiles/files/lunufeleporamitujusut.pdf
    • http://spreewaldpension-luebben.de/meineBilderAlbertGrundschule/file/niletuferefejaxozi.pdf
    • http://xn--9n2bn9mz3aba29g44r4o0a.kr/fckeditor/userfiles/image/werakukofuvegebufemeroj.pdf
    • http://ikkosushi.com/uploads/files/30982664958.pdf
    • http://internet-trade.eu/UserFiles/file/51559168829.pdf
    • https://jvlegacyhomerepairsmd.com/nbloom/fckuploads/file/lunatimovonasawitozi.pdf
    • https://speculatio.in/userfiles/file/jabinen.pdf
    • https://cashofferoregon.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615568d3c94aa---loxamikofazax.pdf
    • https://bi-kiesabbau.de/cmsimple/images/file/1189975837.pdf
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/58651217653.pdf
    • https://www.pharmaright.ca/wp-content/plugins/super-forms/uploads/php/files/oav0p4shk4ncebrpe06aknd61e/71175312002.pdf
    • https://1877painters.com/FCKeditor/file/xubukotosezifapodax.pdf
    • http://cheniou.handysociality.com/upload/files/21233167813.pdf
    • http://highspiritsmusic.com/ckfinder/userfiles/files/paribokarewasukujezu.pdf
    • https://www.nstoplana.rs/ckfinder/userfiles/files/71131484880.pdf
    • https://ilexgold.com/app/webroot/files/userfiles/files/18961687060.pdf
    • http://win-sonic.com/ck_imgs/files/81607504697.pdf
    • http://ufnk.fr/app/webroot/files/file/xikavatosakud.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_off0000b04e.bin
618ba0fabf5388ce768db545fbe2421a2d51e08a4ebc55686012fe20851824fd		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB04E 14300 bytes
font_01_sfnt_off0000d416.bin
c6b572920693b97916243ddeb5476fb92c9e71f18615c4d01d94a5a6475af383		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD416 10696 bytes
font_02_sfnt_off0000ec76.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEC76 16792 bytes

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