Malicious PDF — malware analysis report

Static analysis result for SHA-256 6875cb864f6f8fc4…

MALICIOUS

PDF

86.3 KB Created: 2021-09-09 21:22:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2b9c1b411e6a684bfbc5a399d9df1e12 SHA-1: 9dd78f82acfa43465719de3923e5901835db3e6f SHA-256: 6875cb864f6f8fc4eb5c5f7f4f9632b48f51f4b2070dbdd7f7511f2238a09fe0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are part of a link farm, as indicated by the PDF_SEO_DISPOSABLE_LINK_FARM heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. Although no scripts were explicitly extracted, the structure and heuristics point to a malicious PDF designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9835

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.libroparlatolions.it/backoffice/ckfinder/userfiles/files/59766806414.pdf
    • http://milkexim.ru/imgeditor/file/rakedopogewe.pdf
    • https://expungemyrecordnj.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612f43add112a---luzakuvi.pdf
    • https://rotitelor.com/contents/files/dadozaxokevitibevinobax.pdf
    • http://megalaserasia.com/upload///gilanuvozejinojavobeboj.pdf
    • https://vico-domrep.com/ckfinder/userfiles/files/sowunebu.pdf
    • http://portakalweb.net/home/portakal/public_html/ckfinder/userfiles/files/nefuwirojatig.pdf
    • https://www.tristar-technology.com/ckfinder/userfiles/files/75495992397.pdf
    • https://novinfasteners.com/userfiles/file/92753695779.pdf
    • https://soechi.net/userfiles/file/sixejaxuk.pdf
    • https://auto826.vnpec.xyz/uploads/files/takidipemavumusosalejo.pdf
    • https://nothingbutsafetyglasses.com/userfiles/file/zisetix.pdf
    • https://rux-thai.com/ckfinder/userfiles/files/mowevepezunorevaj.pdf
    • http://aleeblog.com/wp-content/plugins/super-forms/uploads/php/files/0mfu4ea7m5o60o3oossemk82q6/kazudex.pdf
    • http://kibbkw.com/uploads/file/32461770117.pdf
    • http://agppi99.pretty-match.com/upload/files/84254355746.pdf
    • http://tunapvietnam.thietbiotoviet.com/Images_upload/files/12233047644.pdf
    • http://plkorea77.com/ckupload/files/linomelolukakudipuzon.pdf
    • https://aodaixuan.vn/app/webroot/upload/image/files/vopasadixojotege.pdf
    • https://suacuasathcm.com/uploads/files/2029260917.pdf
    • http://impactpluslearning.com/ckfinder/userfiles/files/fapapawije.pdf
    • https://cryptobasics.biz/uploads/files/37081656153.pdf
    • http://architettobotteonpierpaolostudioabacus.it/userfiles/files/xavukoperetajizukabezegaf.pdf
    • http://scenekunstskolen-efteruddannelsen.dk/ckfinder/userfiles/files/borewivagerojijuterivuneg.pdf
    • http://www.ctmmaximoravenna.com/ckfinder/userfiles/files/kuligunitofojow.pdf
    • http://matrix-corporation.com/upfiles/editor/files/ludirujijuwijatizetu.pdf
    • http://mudrkanuch.sk/editor_uploads/system/files/basutofofukuxefaweni.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/ngfLrbzwjls/uplcv?utm_term=best+dnd+5e+character+creator
    • 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_off0000e991.bin
3e4dd1ea4cf0fd48bac9de23522a6220a5aaa9e8547ae9c4533a359b301c699e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE991 19140 bytes
font_01_sfnt_off00011b5f.bin
3f575d443342895d6e0d9467dd93972d276fb3e454b09c340090112fbc65c7dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5F 10516 bytes
font_02_sfnt_off00013355.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13355 16792 bytes

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