Malicious PDF — malware analysis report

Static analysis result for SHA-256 67f5c2946fbc66ee…

MALICIOUS

PDF

71.9 KB Created: 2021-09-16 22:50:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a12cd9e7b208c208ba7bddfed8452ea5 SHA-1: 95332106995dc16b6fd367d0d83e44ae7d6d1a78 SHA-256: 67f5c2946fbc66ee4f082c53aad216eca2d76e7e2d0a4bec91af87de23a2779a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, including one pointing to 'infrive.ru' with a 'hack simcity 2021' UTM term, suggesting a lure for users interested in such topics. The PDF structure also indicates it functions as a link farm on disposable hosting, further supporting a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://infrive.ru/uplcv?utm_term=hack+simcity+2021
    • https://uleshuzatabc.hu/files/file/98726048308.pdf
    • https://digireg.com/upload/58217172499.pdf
    • http://samtekelektrik.com/files/54486195979.pdf
    • http://dxline.eu/userfiles/file/72071878397.pdf
    • http://potya.com/lifibudineramo.pdf
    • http://zenithmetals.com/files/42114361679.pdf
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/e251ec37cfca40d1440851ffdf12355b/479788348.pdf
    • https://www.enviedecrire.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134f84679b06---jafemujepig.pdf
    • http://ps-chiptuning.hu/userfiles/files/pomosexomerewijelomugolu.pdf
    • http://hyunsin.net/userfiles/file/dazamemegiga.pdf
    • https://cornwallstaffagency.com/userfiles/file/94358050891.pdf
    • http://nhatrangpalacehotel.com/app/webroot/upload/files/34985986513.pdf
    • https://zemiigori.com/uploads/file/vonapubozoxexigegoj.pdf
    • http://weilandensemble.nl/ckfinder/userfiles/files/goxagurizujutanulexakofoz.pdf
    • http://uticachemical.com/files/upload/files/sasuwigelaj.pdf
    • https://anglarill.net/userfiles/file/kojasiduzosibivawewobuwi.pdf
    • https://parkettworld.com/upload/files/mewazuzisovaposurev.pdf
    • http://arcdesantmarti.com/biocop/Images/images-editor/file/sujijazojajokodod.pdf
    • https://aymexco.ro/ckfinder/userfiles/files/pogufijifisegal.pdf
    • http://scamps.biz/userfiles/file/webafetawukupegawagu.pdf
    • http://gibisch.com/files/files/17542625016.pdf
    • http://ilturismoinitalia.it/userfiles/files/74916852507.pdf
    • https://pelicanfinancialnetwork.com/ckfinder/userfiles/files/55192246095.pdf
    • https://clap-bas.com/userfiles/file/86332727774.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_off0000b6fe.bin
05b07f06d4ebbd0c66cf359e4be420363b2f422b51f04fc1b8689b086b2d1897		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB6FE 10380 bytes
font_01_sfnt_off0000ce9f.bin
8cf8ce5af13bf283854dda07e2af9bd3283618339f4e469e511b834e61efdc1a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCE9F 16900 bytes
font_02_sfnt_off0000fa1f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA1F 16792 bytes

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