Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b06dd1a15fd6584…

MALICIOUS

PDF

83.6 KB Created: 2021-09-17 02:21:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: ac2b902641dd0bb5cfdfe93f45b7f45f SHA-1: 856ecacdb7ded53bf9a9d5ff00d9c2133550cd6a SHA-256: 7b06dd1a15fd6584e9ba5bc6269929193ba977b4c1612da4602a1fe5b8985cff
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to link farms hosted on potentially disposable domains, suggesting an attempt to obscure the final malicious destination. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a strategy to distribute malicious links across many domains. While no scripts were explicitly extracted, the nature of the embedded URLs and the ML classification suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9607

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://www.aukuras.org/ckfinder/userfiles/files/tipudeberufifu.pdf In PDF document text
    • http://archiwum.wyryki.eu/admin/ckfinder/userfiles/files/41851914225.pdfIn PDF document text
    • http://syntra.pl/userfiles/file/69432647780.pdfIn PDF document text
    • http://viprealestatebrokers.com/userfiles/files/tamotopavevinodenowupetip.pdfIn PDF document text
    • http://parvazyab.net/basefile/api203/files/wefosadi.pdfIn PDF document text
    • https://geneticapanama.com/userfiles/file/39075090323.pdfIn PDF document text
    • http://cleversystems.ru/userfiles/file/gojonojuwesukojoromiwute.pdfIn PDF document text
    • http://bsp-plovdiv.org/ckfinder/userfiles/files/velururezufowufem.pdfIn PDF document text
    • http://namuvaldymas.lt/userfiles/file/domeku.pdfIn PDF document text
    • http://n2nnetworks.com/files/others/mivonijoxe.pdfIn PDF document text
    • https://abandassociates.com/ckfinder/userfiles/files/96236904202.pdfIn PDF document text
    • http://poiskvod.ru/images/file/78976448122.pdfIn PDF document text
    • https://strategieb2b.com/userfiles/file/74494669327.pdfIn PDF document text
    • http://bio86.fr/userfiles/fichiers/xaxamoke.pdfIn PDF document text
    • https://k-kompany.ru/wp-content/plugins/super-forms/uploads/php/files/249e3ff238c38406a8dbeb1d0bd56948/gerizokodiwewe.pdfIn PDF document text
    • http://bjxbw.cn/userfiles/file/durejafif.pdfIn PDF document text
    • https://buddhaart.in/userfiles/file/gotefixubu.pdfIn PDF document text
    • https://marupyara.com/fotos/userfiles/file/rizag.pdfIn PDF document text
    • http://vakantie-noordlimburg.nl/ckfinder/userfiles/files/kivubipiwiwewewetavebimo.pdfIn PDF document text
    • http://tech-sub.com/userfiles/file/18421464508.pdfIn PDF document text
    • https://mlbcsimleague.com/ckfinder/userfiles/files/332523810.pdfIn PDF document text
    • https://anyimaker.com/upload/users/files/85103884875.pdfIn PDF document text
    • https://www.luxboss.com/ckfinder/userfiles/files/fisogogamene.pdfIn PDF document text
    • http://studiomistretta.com/userfiles/files/xiwabewiroloxuv.pdfIn PDF document text
    • https://fizjolech.pl/userfiles/file/taxokenutarivewadudus.pdfIn PDF document text
    • http://contua.org/userfiles/file/19460487188.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/1613593997bef3---44353100527.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=vishnu+sahasranamam+lyrics+in+english+with+meaning+pdfPDF link annotation
    • 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 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba45.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA45 16104 bytes
SHA-256: 4204f4a647e3e8488fc3125e36d68471fcc515b787f7ef36a685bb1e406e82a7
font_01_sfnt_off0000cf91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF91 11216 bytes
SHA-256: c99e7540d65bd0dd4adfcc7417f622788ca4bb22fc4646ab514e883d94ad06e2
font_02_sfnt_off0000e984.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE984 20704 bytes
SHA-256: fcc0491624571965d1beb1055e771167420057f45de0818738b36cf90ec730d8
font_03_sfnt_off00011f17.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F17 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_04_sfnt_off00013724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13724 1680 bytes
SHA-256: 6c08887b596ecb472c5a0482df8c2f828d83fc5b5d16111ed0caa1fced1b35dc