Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e9157205b713d9b…

MALICIOUS

PDF

74.2 KB Created: 2021-09-20 05:47:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: fd8936e384331d6ea32b9852fff0a0e0 SHA-1: 7cae1cf0c7d8b7f672be71a51e29b995e38c0f65 SHA-256: 3e9157205b713d9bb0cebe8441aaecdabaa57bd43d0b69d047f34b5820468bd2
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ClamAV as a phishing trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs pointing to what appears to be a link farm, likely intended to obscure the ultimate destination and evade detection. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users through multiple domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 6

  • 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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://vongtaytramhuong.vn/upload/files/45801083714.pdf
    • http://lagunaapartman.hu/images/user/file/xesubader.pdf
    • https://johanbjerke.se/userfiles/file/50284163821.pdf
    • https://simondaulte.com/ckfinder/userfiles/files/78000500812.pdf
    • https://goez3.com/10005001208290177/ckfinder/userfiles/files/56095457136.pdf
    • http://akicgiyim.com/userfiles/file/fowutekegokogubelefini.pdf
    • http://crystaltrade.hu/data/file/wotexowubipewikinu.pdf
    • https://signika.pl/Upload/file/lenexubalulufod.pdf
    • https://doxity.ro/ckfinder/userfiles/files/43551601877.pdf
    • http://hondatayho.top/img-ngocbao/files/vifezutopikisuteduziwidu.pdf
    • http://www.singchai.co.th/ckfinder/userfiles/files/todomojewodawolefodutuvu.pdf
    • http://www.melodypods.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e67d1e5b19---sejaj.pdf
    • http://polletnv.be/uploads/files/96664203193.pdf
    • http://benetworkingpro.com/ckfinder/userfiles/files/komupa.pdf
    • https://kenhquangcao.vn/uploads/files/93025683976.pdf
    • http://www.tempshift.com/app/webroot/files/uploadimagesfile/tenovuwada.pdf
    • https://artinterior.bg/userfiles/file/zilasavul.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=mars+live+super+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_off0000bfdb.bin
7adec9f38e2032856cac4896f2c7d6f1d71930f25138956664beb7601e6dfa75		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBFDB 10172 bytes
font_01_sfnt_off0000d6c1.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD6C1 16792 bytes
font_02_sfnt_off0000eed3.bin
d5261a84bae46c86e4a4f017c8e53691eb6c34ccb0df5ae236d1d47e1b13e42e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEED3 17300 bytes

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