Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53140867e4e1253…

MALICIOUS

PDF

72.0 KB Created: 2021-09-25 12:05:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a2f8be2dd0de9ded541a404d3d05c4e3 SHA-1: 17e423977e0636fb4b69c3fd06b5184fe3a463b9 SHA-256: b53140867e4e12534f2cff6cb4a228440055854a45dd982042ec7392bcabee04
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous embedded URLs pointing to external resources, suggesting it's designed to redirect users. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM indicates these links are likely part of a link farm on disposable hosting, a common tactic for phishing or malware distribution. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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://reelproductionshd.com/userfiles/file/keruvobo.pdf
    • http://safetruck.gr/images/file/radazuwaxifukuj.pdf
    • https://hotelristorantenovecento.it/wp-content/plugins/super-forms/uploads/php/files/beedcd8d8e372b996d3ee0c4661d223c/28495109796.pdf
    • https://fajndoktor.cz/images/file/files/1275101774.pdf
    • http://naszymsladem.pl/upload/file/24164054681.pdf
    • http://slxiang.com/v15/Upload/file/20219151825368316.pdf
    • https://lensmam.com/userfiles/file/tefaxipelikedetolufaz.pdf
    • https://propiedades.net/ckfinder/userfiles/files/84583363943.pdf
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/xewowunor.pdf
    • http://smartcookieacademy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b73f74fcc9---bazigabediwebuwuzutake.pdf
    • https://ijfbacknumber.com/editor_up/dexorori.pdf
    • http://stomerijindex.nl/images/uploads/koxiwijun.pdf
    • https://gdaniec.com/upload/files/88675921734.pdf
    • https://kp-bs.ru/upload/files/labidipevavozikipejamub.pdf
    • http://gndpta.eu/news_objects/files/53468939147.pdf
    • http://alatasfilms.gr/ILC/img/file/gitufadijimofupeluzumo.pdf
    • https://pomtco.com/technical/files/file/77487118765.pdf
    • http://xn--or3bo5mvlb.com/data/editor/file/34705316229.pdf
    • http://cy2hand.com/userfiles/xepux.pdf
    • http://www.gulbaharsigorta.com/contentData/file/50247860417.pdf
    • http://frezerovka.by/images/fxeditor/file/97225601787.pdf
    • https://jv-cms.crazy-jessie.nl/uploads/files/pepepotogam.pdf
    • https://bikeid.net/ckfinder/userfiles/files/55254425365.pdf
    • http://fotografieindex.nl/images/uploads/marowur.pdf
    • http://www.musicboxpiano.com/contentfiles/32981766572.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=dream+league+soccer+mod+apk+2018
    • 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_off0000b4e4.bin
d1bbb52bc942ef5c86fac2c254c9fd13455e8e711c5d4a52192fa0dfaacc3f92		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB4E4 11260 bytes
font_01_sfnt_off0000cf38.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF38 16792 bytes
font_02_sfnt_off0000e74a.bin
62a3ddb9c3b057cd1a53b7499ee29de9cf4ec128cfea7625a08f49c7243efcaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE74A 16712 bytes

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