Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d5a18b9a984898b…

MALICIOUS

PDF

90.3 KB Created: 2021-09-14 04:54:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 80e507d43ce8e270c357dec100414893 SHA-1: 1863e7353a5c4157aba17022c5f67f1b4295e507 SHA-256: 7d5a18b9a984898b2045bc34c5d97698049facce58683282d8b8e13225572069
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains numerous embedded URLs pointing to a link farm hosted on potentially disposable domains, a common tactic for phishing or distributing further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically indicates a link farm structure designed to obscure the ultimate destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 5

  • 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.
  • 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://sushigonewildtogo.com/uploads/files/4050117102.pdf In PDF document text
    • http://abwcolley.com/uploads/files/56587063181.pdfIn PDF document text
    • http://platcometals.com/images/file/33897120841.pdfIn PDF document text
    • http://phuquytravel.com/nguyenvanlinh/files/73113993736.pdfIn PDF document text
    • https://datxeninhbinh.com/data/dulieu/files/nemodetogugufojaz.pdfIn PDF document text
    • https://sysyanginguvenlik.com/uploads/files/16552457688.pdfIn PDF document text
    • http://huanghels.com/filespath/files/20210907003531.pdfIn PDF document text
    • http://colantuono.it/userfiles/files/nuzedidokokijowobitapa.pdfIn PDF document text
    • https://www.bramfordgc.co.uk/ckfinder/userfiles/files/73364105584.pdfIn PDF document text
    • https://ismet.com.br/ckfinder/userfiles/files/77689582534.pdfIn PDF document text
    • https://strongpointmarketing.net/userfiles/file/75179146309.pdfIn PDF document text
    • https://pinpointfeedtech.com/ckfinder/userfiles/files/lunokilinopevokepurewufed.pdfIn PDF document text
    • https://aukshanya.promosing.com/alpha/ckfinder/userfiles/files/84582129919.pdfIn PDF document text
    • https://ooo-kenk.ru/userfiles/file/mawigopozikat.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/19450173543.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109082051308344.pdfIn PDF document text
    • http://fc-junajted.com/upload/datoteke/lixiloruponasew.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/42019043313.pdfIn PDF document text
    • https://eltonltd.ru/sites/default/files/uploads/49602669563.pdfIn PDF document text
    • https://dondepodemosir.com/userfiles/file/zipup.pdfIn PDF document text
    • http://pilanatofishing.com/home/sandbox/domains/shelter.sandbox.tritek.hk/public_html/ckfinder/userfiles/files/lomasafipalomidubikulen.pdfIn PDF document text
    • http://ichieh.tw/uploads/files/202109132034385266.pdfIn PDF document text
    • https://behbehaniprojects.com/uploads/files/fibifofixotizopupakugop.pdfIn PDF document text
    • http://nesemlak.com/test/images/uploads/files/38795942503.pdfIn PDF document text
    • https://www.institutvzdelavani.cz/files/fofegoxasejiwobeje.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=2021+sandbox+gamesPDF 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE20 10692 bytes
SHA-256: dad1b1c7c64089dc333db054e139dc6a6b73c7146f259435930da32c7694ef50
font_01_sfnt_off0001167e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1167E 17544 bytes
SHA-256: 051a4eef2a11fab11c90761ec4b30aaeb010aa4aa4f73251f8b559c7684b9bba
font_02_sfnt_off000143a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1