Malicious PDF — malware analysis report

Static analysis result for SHA-256 d4b80e1d77379c92…

MALICIOUS

PDF

76.7 KB Created: 2021-09-16 23:57:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 59c306288553f559fbee19952e9d2ee5 SHA-1: 35168e9791feef665aef9293d354a3c3c5d16f29 SHA-256: d4b80e1d77379c92e113585c2a49735187a812d70af6dcfa3fb163c35446d3ef
126 Risk Score

Malware Insights

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

The PDF was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains numerous embedded URLs, many pointing to disposable domains, and one heuristic specifically identified it as a link farm designed for malicious purposes. The presence of these links suggests an attempt to redirect users to phishing or malware-hosting sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://cnc-soustruzeni.cz/files/file/39965103385.pdf
    • http://weforyou.it/userfiles/files/77793953419.pdf
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/10413812201.pdf
    • http://hkxhjfc.ltd/uploads/files/20210906050917.pdf
    • http://reclameindex.nl/images/uploads/3343078189.pdf
    • http://vietsonplastic.com/uploads/userfiles/file/vonilu.pdf
    • https://grdr.org/paidel/ckfinder/userfiles/files/xeviwidologedokuru.pdf
    • http://mingmitrcoffee.com/user_img/files/bomozatulivu.pdf
    • http://ulv-fogger.es/d/files/wubapewofisejozo.pdf
    • http://aeronautike.com/userfiles/file/35035807807.pdf
    • https://sahyadrisevasanstha.in/userfiles/file/xareg.pdf
    • http://dongshengcable.com/images/upload/File/rojeforogude.pdf
    • http://udaybharat.in/ckfinder/userfiles/files/biwokuzemubaxojebodem.pdf
    • https://leise.ru/admin/ckfinder/userfiles/files/54340520157.pdf
    • http://www.investinwielkopolska.pl/application/lib/ckfinder/userfiles/files/96311931936.pdf
    • http://dirpub.org/editor/ckfinder/userfiles/files/56562289987.pdf
    • http://hertzlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96877584548.pdf
    • https://hk-delight.com/UploadFiles/file/14742502388.pdf
    • http://www.qookspot.kitchen/wp-content/plugins/formcraft/file-upload/server/content/files/16132e2c904fb6---tiwomagexofanokokulobelez.pdf
    • http://wskinbody.com/data/boardData/files/63359899917.pdf
    • http://valsadindustries.com/userfiles/file/xopotenodododudusew.pdf
    • http://1night2daytour.com/ckupload/files/namexapagasajiregikove.pdf
    • http://horizonpestservices.com/userfile/nozevi.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=how+to+change+apk+version+using+apk+editor
    • 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_off0000c579.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC579 16792 bytes
font_01_sfnt_off0000dd8b.bin
d33c588f23506fe98195a7371e36ef04db384f40c715dad015a633a83146cf78		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDD8B 17308 bytes
font_02_sfnt_off00010ab7.bin
78ad4d018abf947685b5fba9e672b04e537941243e82e7cb77bb9570af9ce8d7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AB7 11084 bytes

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