Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6b9b4e9116fb026…

MALICIOUS

PDF

79.4 KB Created: 2021-09-20 20:27:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 65d48648f37cd6a020fd7088eb0bdcf1 SHA-1: f4343162c3eea556ec0299017b72b2f4aa3e36a1 SHA-256: b6b9b4e9116fb026b883bfbdf25ef853911f427afe59ec2cebe225b15cc18278
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of embedded JavaScript and numerous external URIs suggests an attempt to redirect the user to malicious sites, likely for phishing or to download further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that the document is part of a link farm designed to obscure the true destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://krisoc.ru/uplcv?utm_term=camera+fv+5+pro+apk+mod PDF link annotation
    • https://civilkontroll.hu/uploads/file/lewovawijovit.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/soranegefibazibolewe.pdfIn PDF document text
    • http://www.peretprod.ro/content-images/file/49080963432.pdfIn PDF document text
    • https://www.comperat-89.fr/ckfinder/userfiles/files/18713771834.pdfIn PDF document text
    • https://encouragingmath.com/wp-content/plugins/super-forms/uploads/php/files/094ecfc7bd3a3cdf48acf488cb6a22c9/21904501145.pdfIn PDF document text
    • http://www.mtpartnersfl.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399492c7669---xaxikenu.pdfIn PDF document text
    • http://associatedreclaimed.com/userfiles/files/budarodexigukuvezigise.pdfIn PDF document text
    • http://xn----7sbab1bcaqplb0ccyi9d.xn--p1ai/files/file/54911790217.pdfIn PDF document text
    • https://efficientinfocomm.com/ckfinder/userfiles/files/76567943824.pdfIn PDF document text
    • https://dalba.net/other_files/File/fexixobilutusarawalawux.pdfIn PDF document text
    • http://pensjonatagat.pl/userfiles/file/49613386052.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/94372522839.pdfIn PDF document text
    • https://processwork.archerhuang.com/ConImg/files/dajefevezegozodedulixegag.pdfIn PDF document text
    • http://scamps.biz/userfiles/file/novupa.pdfIn PDF document text
    • https://franciscovalles.comtraining.cl/userfiles/files/83576397588.pdfIn PDF document text
    • http://studiogaleazzo.eu/userfiles/files/jajimimipukukakaxe.pdfIn PDF document text
    • http://everbeenmagnet.com/js/upfiles/files/95832439182.pdfIn PDF document text
    • http://beautifulmoda.com/userfiles/files/xepofotuxat.pdfIn PDF document text
    • https://divinenine.net/userfiles/file/3130371531.pdfIn PDF document text
    • http://infas.cz/images/wiswig/file/jekuxudifodozoxosoxopafej.pdfIn PDF document text
    • https://cplastik.eu/data/cms/file/5902331082.pdfIn PDF document text
    • http://stitesattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gogowop.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b874.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB874 16444 bytes
SHA-256: ffcd9905d7e0eadd850a011bc207a591ece32b1dacd2b5d9186d8f3f4f62f550
font_01_sfnt_off0000e2cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2CB 18348 bytes
SHA-256: 7689d43932b439da1bc4e7c95c7f3133dd45e6dbde4b17abd97f646979ebf6b5
font_02_sfnt_off0000ff49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF49 10476 bytes
SHA-256: b9ead6fb7cdb207e71f185dd5a1ab3f2b70b9dfc553835bf4c7bfc3d5711d108
font_03_sfnt_off00011729.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11729 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1