Malicious PDF — malware analysis report

Static analysis result for SHA-256 f829f0a2caadc1f0…

MALICIOUS

PDF

83.3 KB Created: 2021-09-09 07:52:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: ca39bc4d1c3d012e7b1f91ced5f50a5c SHA-1: 23ff699513a830bff0099da9a75406ce3c9b81c1 SHA-256: f829f0a2caadc1f003cc150b9277596a4eb3e54d986b1b214c49789883e9f558
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed as a link farm, likely to redirect users to malicious sites. While no scripts were explicitly extracted, the nature of PDF-based threats often involves embedded JavaScript for malicious actions, hence the inclusion of T1059.007.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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 https://stiff.pl/ckfinder/userfiles/files/50745939096.pdf
    • http://riversedgefm.com/files/file/43325398504.pdf
    • http://slxiang.com/v15/Upload/file/2021971533126807.pdf
    • https://maloneslandscape.com/wp-content/plugins/formcraft/file-upload/server/content/files/161329e68786a0---59300026533.pdf
    • http://mtkshop.com/images/uploads/file/daxerobaligokuzug.pdf
    • http://abwlargo.com/uploads/files/22690264709.pdf
    • http://studiospazioambiente.it/userfiles/files/pewumujivonidabupirik.pdf
    • http://sivam.pl/files/file/vemapoloma.pdf
    • https://torgradio.ru/new/files/file/91079410114.pdf
    • http://nepalbestcargo.com/userfiles/file/waneramegorax.pdf
    • http://studiopol.it/userfiles/files/radidopodefarisek.pdf
    • http://canoeing.by/pics/files/sugadarukax.pdf
    • http://stolizstekla.ru/userfiles/file/63085070824.pdf
    • http://daimarconstrucciones.com/images/admin/file/85704957074.pdf
    • http://www.finanzanlagen-honorarberatung.de/wp-content/plugins/formcraft/file-upload/server/content/files/161386c3ecde9a---xolidugoneviburoboxakafik.pdf
    • http://awarelaxcentrum.cz/user_files/file/21483106943.pdf
    • http://ekachaiguitarist.com/ckfinder/userfiles/files/70804350406.pdf
    • https://iveducentar.com/uploads/assets/file/luxusawivinajawolubew.pdf
    • https://e-room.co/userfiles/file/57136896439.pdf
    • http://savytrading.com/userfiles/file/gimojijososibi.pdf
    • http://driscollandgibson.com/images/edit_images/file/83524680076.pdf
    • https://loyallcanada.net/editor_files/file/66195553702.pdf
    • http://xn--9w3b270a7kf.kr/ckfinder/userfiles/files/bumidoditapefazamo.pdf
    • https://mitrasuksesku.com/userfiles/file/29711434278.pdf
    • http://caramelitos.sk/files/74007170471.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/A3Ryygt5BCM/uplcv?utm_term=app+saver+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_off0000dcf1.bin
2180d34fa649565a3e32419830864362b13092e8aa63d9bde448266cf4f9185c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDCF1 20556 bytes
font_01_sfnt_off00011205.bin
4f7382f6952d58f7a609edb13e4b7f3c1eabcb621141d780eccabc157701cbc5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11205 9924 bytes
font_02_sfnt_off00012828.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12828 16792 bytes

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