Malicious PDF — malware analysis report

Static analysis result for SHA-256 22787cde35021633…

MALICIOUS

PDF

67.6 KB Created: 2021-09-26 22:51:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 49964c2de45cfa7faadbf47f045f447b SHA-1: e6a4bd9b0f8e185e807bc583973f37ee4e2478da SHA-256: 22787cde35021633a0087b0797c95f580be0228486968e350a47cc2131c59cb2
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating it's designed to redirect users to malicious websites. Heuristics suggest it's an image-based lure, typical of phishing, and ClamAV confirms it as a phishing trojan. The ML classifier also strongly flagged it as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 7

  • 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 67 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://oniceh.ru/uplcv?utm_term=the+tomorrow+war+in+isaimini
    • https://yaofangpeixun.com/upload/files/41354275472.pdf
    • http://form4concrete.ru/pics/cont/file/99957378183.pdf
    • https://bodymason.com/user_uploads/files/68921283683.pdf
    • https://ngonluathan.com/images/ckeditor/files/9287841699.pdf
    • http://phunggia.biz/userfiles/file/44356187549.pdf
    • http://i-harmonics.com/upload/files/zigutotavikireradajexew.pdf
    • https://kawanmto.com/contents/files/29663203464.pdf
    • https://beruanglucu.com/contents/files/pakewasunabi.pdf
    • http://aelma.com/sites/default/userfiles/file/57277779998.pdf
    • https://fo-prefectures.com/pages/files/98704701957.pdf
    • http://computer-rudolstadt.de/upload/file/9821213488.pdf
    • http://jinshi66.com/uploadfiles/files/jazapi.pdf
    • http://braintradingbcn.com/wp-content/plugins/super-forms/uploads/php/files/2157b4aaae65bac630e4f4555e0c86ce/68541317783.pdf
    • http://www.extramas.com/userfiles/files/13412186751.pdf
    • https://aluvioneschicamocha.sinecsas.com/ckfinder/userfiles/files/lexogupikar.pdf
    • https://linker.tw/files/pazizozulopuja.pdf
    • https://embassyinvietnam.com/webroot/img/files/76043385235.pdf
    • http://www.firengo.com/userfiles/files/kumipanekigoxutexagafino.pdf
    • http://mjacz.cz/soubory/files/89118987487.pdf
    • https://pacantioquia.org/aym_image/files/45588635698.pdf
    • http://carneiro-sa.pnh.pt/js/ckfinder/userfiles/files/gesolejubesikolodelekoru.pdf
    • http://le-lemniscus-incandescent.fr/ckeditor/upload/files/72835112956.pdf
    • http://boldino-hotel.com/ckfinder/userfiles/files/57363832346.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_off0000ad1d.bin
601f41a329cc350e257ec522fba175b6e68e391602a537b84dc380bc0f80750e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xAD1D 14272 bytes
font_01_sfnt_off0000cfe4.bin
6ca2079f48bc707a1001d27bff66dcd1189a1b1def8541730c42f6188ec7293d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCFE4 10376 bytes
font_02_sfnt_off0000e740.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE740 16792 bytes

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