Malicious PDF — malware analysis report

Static analysis result for SHA-256 76424d7923acef28…

MALICIOUS

PDF

72.5 KB Created: 2021-10-03 15:56:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 13caa990433f26db997ab8898ecd9108 SHA-1: 9711ceede1bac087517dc7c215789111c0eadbef SHA-256: 76424d7923acef28d1c18513f27b008dc44287abfb9ffb910da594d8c7b23605
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly suggest this PDF is malicious, likely a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards an attempt to lead users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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 https://queure.ru/uplcv?utm_term=sites+to+download+indian+movies+with+subtitles
    • http://ifaistos.reality.gr/~triantaf/images/file/66283782311.pdf
    • http://meruzhankhachatryan.com/app/webroot/files/file/zewakepomilifomulutuk.pdf
    • http://ecilingirler.com/resimler/files/dizafora.pdf
    • https://angelsforwarriors.org/userfiles/files/1434098863.pdf
    • http://sz-nuoyi.com/Upload/file/2021091407083284371.pdf
    • http://ropesadventure.com/d/files/zukakudanumalabakanuj.pdf
    • https://citronixdeflection.com/nbloom/fckuploads/file/dirozewef.pdf
    • https://nulifeus.com/~nulife/userfiles/file/34115157817.pdf
    • http://hotelalbicia.com/userfiles/file/67072021833.pdf
    • http://senseoftourism.dk/userfiles/file/nirixafumixaniwupiti.pdf
    • https://matfplayer.com/calisma2/files/uploads/sabijarulebepoku.pdf
    • http://thcsducthang.pgdbactuliem.edu.vn/ckfinder/userfiles/files/lovopuzigebupiwa.pdf
    • http://zsdbiopharm.com/upload/files/62892433548.pdf
    • http://siciny.eu/userfiles/file/21579196966.pdf
    • http://1qjd.com/upload/files/2021-09-30-23-13-44-d1wsiD8Y.pdf
    • http://tingchucontrol.com/Uploadfiles/files/ziparijedodoxode.pdf
    • http://freestyler.cz/img/file/77203122510.pdf
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/feb809b48a17b851ae3ec2605a61a837/92529772752.pdf
    • http://shlawllc.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/kiwajusejoz.pdf
    • http://www.investing-in-women.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613d2faec86e1---rokitokekafimaxuw.pdf
    • http://imhyuk.com/imhyukeditor/userfile/file/rurawomig.pdf
    • http://kfnmsz.com/upfolder/e/files/20210910120400.pdf
    • http://back2wood.de/userfiles/file/93739271499.pdf
    • http://dlzj.net/upload/files/20210915163155797602.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_off0000b428.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB428 16792 bytes
font_01_sfnt_off0000cc3f.bin
a1c525607489a479265662ade59274b891c59a40ac75de6e010283d7bc87d0b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC3F 10880 bytes
font_02_sfnt_off0000e538.bin
ed5e5da62c649f86f54b9d9505f2a0dfabaa82a9ec9c004936c9853fe45d7498		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE538 17328 bytes

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