Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5957fbbfa011d1e…

MALICIOUS

PDF

87.2 KB Created: 2021-09-11 20:51:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a758b2c72552f3c9bab02d03e88bcbd9 SHA-1: 1c2040e4559de1e6e1acf6f03709855d4b45d9ab SHA-256: e5957fbbfa011d1e14975669feeaf460242fb56228793e857c949bd2c5ddc8fb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous embedded URLs pointing to various domains. The presence of 'utm_term_redirector=True' suggests an attempt to obscure the final destination and potentially track user clicks.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://www.kowel.com/ckfinder/userfiles/files/1630937494.pdf
    • https://rubyyadav.com/nbloom/fckuploads/file/wejazuvujobedetejefawow.pdf
    • https://felicityokolo.com/file/40645165535.pdf
    • http://www.nationaalgolfcongres.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1613761aa988b1---xipopapasukobonoja.pdf
    • http://www.anclupnapoli.it/userfiles/file/gegerevudoniv.pdf
    • http://yjccnc.com/upload/files/ragajotofuvefovav.pdf
    • http://hide-bo.com/img/tmp/file/xufipukino.pdf
    • http://anquocrealty.com/uploads/image/files/felubaxejenagikobedaxobel.pdf
    • https://yournew.site/wp-content/plugins/super-forms/uploads/php/files/ti45a9r7vrmunprbm4f6hge6tf/jivafanozalepa.pdf
    • http://emailreceptionist.net/userfiles/file/75017776147.pdf
    • http://autosoftware.company/autoresponders_images/files/12860170604.pdf
    • http://vanprodukt.cz/UserFiles/File/buzipuso.pdf
    • https://internationalmedia.com/userfiles/file/silezasatowut.pdf
    • http://elitacasa.it/images/file/pibemawamojegoxutugere.pdf
    • http://karpatskiles.ru/store/files/mapekekete.pdf
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/rorideb.pdf
    • https://deesudcoolingtower.com/userfiles/file/sujas.pdf
    • https://wcfkenzi.com/ckfinder/userfiles/files/fajub.pdf
    • http://sky1981.com/asset/uploads/files/bojijuguko.pdf
    • http://ibtaker.ps/userfiles/file/16406838676.pdf
    • http://shortguycentral.com/ck_uploads/files/dazelumatimirufuw.pdf
    • https://xn--22ck6bdp5cach0mc23a.com/ckfinder/userfiles/files/duzolime.pdf
    • https://hotnews.md/upload/userfiles/files/29645738254.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=250mb+marvel+avenger+ppsspp+iso+game+for+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_off0000ed92.bin
833846ec9facdae15103cfec71d841a8ad293d53de3a21b32011a8dd2c925b56		 pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 18412 bytes
font_01_sfnt_off00011cc2.bin
a4739b872609a748244ac8a3facbb97c535f7bbdfc678f06b5bd5dca66bb6e64		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CC2 11228 bytes
font_02_sfnt_off000136a9.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136A9 16792 bytes

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