Malicious PDF — malware analysis report

Static analysis result for SHA-256 c74867e9743257ed…

MALICIOUS

PDF

69.0 KB Created: 2021-09-19 05:26:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 12a60e7569ea823104a327b3e0cdb38a SHA-1: 7c1c3d6d0f52645fc5fd5410276daeb9f1d79f6f SHA-256: c74867e9743257ed40f5f42dd0e3a867ebee85a357c92d0d656b8384a220eeaa
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and the numerous external URLs suggest a link farm or phishing campaign designed to redirect users to potentially malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • 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 http://anhhieu.vn/hinhanh/file/45387580250.pdf
    • https://paymentor.nl/uploads/file/28994835643.pdf
    • https://sayurhijau.com/contents/files/jobekobizabeminoz.pdf
    • https://www.totspotdaynursery.co.uk/ckfinder/userfiles/files/mamelemanavegiwipika.pdf
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/161425846cfc2b---fifabuzozove.pdf
    • http://zerosquareonline.com/file/mufupas.pdf
    • http://kolesnikov.pro/ckfinder/userfiles/files/89396901253.pdf
    • http://anchor-m.com/js/upload/files/95783808584.pdf
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/zowexuketatajedokalab.pdf
    • https://kawanmto.net/contents/files/28158907606.pdf
    • https://fengshan-zhennangong.org/upload/ckfinder/files/gifalisasisegoboxegipix.pdf
    • http://stoka-saarlouis.de/userfiles/file/wepojigatugo.pdf
    • http://autoscuolemontagna.it/userfiles/files/zojabegufojepodave.pdf
    • http://ghefoot.com/fckeditor_userfiles/file/joxozekilakikekorevik.pdf
    • https://cosplay-expo.it/ckfinder/userfiles/files/74105801264.pdf
    • http://flomojapan.com/upload/files/75543011732.pdf
    • http://mebel-moscow.com/content/xuploadimages/file/fomozufifejuvixege.pdf
    • https://markzone.az/wp-content/plugins/super-forms/uploads/php/files/9qg62albe8tei49jn14f8lkf0j/dubaxaritu.pdf
    • http://ghalemdi.com/userfiles/file/devudubiwuperobeguzeluzo.pdf
    • http://lejuriste.ru/files/file/dodebawetixe.pdf
    • https://koncnc.com/genelresimler/file/79390885000.pdf
    • http://jtylek.pl/Upload/file/80237816895.pdf
    • http://cabanagarden.hu/editor_up/53579582603.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/cv9VXjIrmdE/uplcv?utm_term=my+mobile+apk
    • 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_off0000b1b6.bin
d87b498cda20c375a24134268ef8889a6884c4699889b73c2b2007fc6b393488		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB1B6 14952 bytes
font_01_sfnt_off0000d78b.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD78B 16792 bytes
font_02_sfnt_off0000efa2.bin
b58b10129ee43f96e7be95d3d8ee487392b5b5dd37c9a25ee6910801d1d0648b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA2 10280 bytes

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