Malicious PDF — malware analysis report

Static analysis result for SHA-256 d920232ca2454109…

MALICIOUS

PDF

71.2 KB Created: 2021-09-17 23:37:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 581e7a1b79ef5540adf57643bac11879 SHA-1: 0e7a85091dd04a10cf7b682cf9a1f547a9275ab8 SHA-256: d920232ca24541099fca9bf772987a24673b0a09a8dec5218196e6abb945edd7
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The sample's structure and numerous links point towards a link farm or redirection mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://archism.ru/uplcv?utm_term=rifts+dinosaur+swamp+pdf
    • https://bnovum.hu/downloads/daxugafojejikada.pdf
    • http://dgjinhak.kr/DATA/upload/files/202109050300327998.pdf
    • http://crystal-lamp.ru/uploads/files/43332889621.pdf
    • http://www.performhabitat.fr/bundles/astadmin/js/ckfinder/userfiles/files/pulapajuruwegagigepuw.pdf
    • https://afra24.com/basefile/afra24/files/70867972332.pdf
    • http://popnmusic.fr/userfiles/file/26045960408.pdf
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/17434273144.pdf
    • https://crownprolaw.com/userfiles/Proj_Name/files/vubemove.pdf
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/11890291560.pdf
    • https://kccegis.com/upfiles/content/file/20210914122047.pdf
    • https://landatur.com/files/galeria/files/86842531533.pdf
    • https://gres-k.cat/userfiles/file/42911528890.pdf
    • http://alanaf.ru/userfiles/files/63186514346.pdf
    • https://my-natural-style.net/upload/files/bofefutexa.pdf
    • https://pamukoglu.com/userfiles/file/suremibuwazeroxomediluf.pdf
    • http://sun-green.be/ckfinder/userfiles/files/63288474405.pdf
    • https://sjamsul-hidajat.id/ck_uploads/uploads/files/93596066258.pdf
    • https://huangs.tw/uploads/files/202109131732355952.pdf
    • http://0975811252cool.linker.tw/files/xonajumivixuk.pdf
    • http://wawa757.com/uploads/files/93059838536.pdf
    • http://mariondhuique-mayer.com/data/file/jojakuki.pdf
    • http://urbancollab.com/userfiles/Proj_Name/files/53486152789.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_off0000b135.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB135 16792 bytes
font_01_sfnt_off0000c947.bin
af591ac67ec1122f504c493c3ebc4a10763e0037acbe16152a6a6424620ce2a3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC947 17648 bytes
font_02_sfnt_off0000f6f0.bin
9b83661c5bc6b4dad64b6632ca602812ebd1fbdc6bd48115236b44fa1874c75a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF6F0 10712 bytes

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