Malicious PDF — malware analysis report

Static analysis result for SHA-256 902464a476236584…

MALICIOUS

PDF

73.8 KB Created: 2021-09-27 12:11:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 1f934a9cdbbd57925979242923191a23 SHA-1: aa6a6db2dc821996456e53d2e3cee9b84d61b6ae SHA-256: 902464a476236584046c68fc8c799e2a514a339f0405c12df32d4b0345c924c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. The PDF structure and embedded URIs point towards an attempt to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://crewmak.ru/uplcv?utm_term=supernatural+childbirth+free+download
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/wibaruwi.pdf
    • https://accesoriosalmayor.com/images/userfiles/file/zegawe.pdf
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/45089181513.pdf
    • https://girisimhaber.com/uploads/file/88984320335.pdf
    • http://bzws.zhanyougame.com/ckfinder/userfiles/files/23230848595.pdf
    • http://nhatngungoisaoxanh.com/upload/files/95883162390.pdf
    • http://bike-aholic.com/UserFiles/file/jimixekewizinufarurib.pdf
    • https://leifs-auto.dk/images/file/tipazigarijidumofimogap.pdf
    • https://firsatpin.com/calisma2/files/uploads/bikuzaxamegaso.pdf
    • http://maternites-catholiques.org/ressource/site-image/files/vukatulalezej.pdf
    • https://drivingschoolofnorthtexas.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139a5a65595e---75725460426.pdf
    • http://lsphc.com/userfiles/file///26194473645.pdf
    • http://mazraeir.com/images/upload/files/babikifefuralibamuxozafim.pdf
    • http://www.heksan.com.pl/file/bapap.pdf
    • http://tamtamphat.com/upload/files/83828182029.pdf
    • http://saraya-shop.ru/upload/files/36444700012.pdf
    • http://bebelino.ru/userfiles/file/107514735.pdf
    • http://doorsatyrau.com/ckfinder/userfiles/files/29757139221.pdf
    • https://wanfutemple.urwaydesign.com/data/file/userfiles/files/80993807231.pdf
    • https://funbugs.ie/userfiles/file/jowoso.pdf
    • http://epoptavky.com/is/images/FCKeditor/File/3226256233.pdf
    • http://detskaoptika.cz/ckfinder/userfiles/files/kijojok.pdf
    • http://taxiluzern.ch/khurasan/userfiles/files/97836906928.pdf
    • http://dulichgiahy.com/upload/file/xopumebugusazumew.pdf
    • https://lrsdev.com/userfiles/file/76675761686.pdf
    • https://santa.sg/images/users/00000000/files/25435969287.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_off0000b735.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB735 16792 bytes
font_01_sfnt_off0000cf4c.bin
b040738a8406022e8c59476a867155a742ed6aadd9c9de215ae6e79e1e2df218		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF4C 10948 bytes
font_02_sfnt_off0000e868.bin
0a87028fc22d15ae28cebb2ea83448146df1901b7d1dc71cb4e2fad8262502e8		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE868 18680 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.