Malicious PDF — malware analysis report

Static analysis result for SHA-256 064526a13ac9ebe7…

MALICIOUS

PDF

86.9 KB Created: 2021-09-19 02:01:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 70d078d4947a942962d0059663fa6fcd SHA-1: 21b9b88d8b1e6de8bad35d1b33dcc518830f6da9 SHA-256: 064526a13ac9ebe7426ad8ca7220f46302eb48fc1511d2127723551372dc4c19
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. Multiple embedded URLs point to unknown domains, suggesting an attempt to redirect users to malicious content. The document body is heavily obfuscated and unreadable, providing no direct clues to its intent beyond the heuristic findings.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://fslawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/96306283861.pdf In PDF document text
    • http://www.hj-bouwt.be/wp-content/plugins/formcraft/file-upload/server/content/files/1613f838f6867b---fofefalazejubiwesoperi.pdfIn PDF document text
    • https://cjsc.se/ckfinder/userfiles/files/68142912743.pdfIn PDF document text
    • https://businesslife.com/content/file/wavawobitumasokipipidevi.pdfIn PDF document text
    • https://selectwifi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140375b3091c---19980948362.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/nutir.pdfIn PDF document text
    • https://www.corpeverest.com/ckfinder/userfiles/files/gagakirowibaferazurinona.pdfIn PDF document text
    • http://zrdb-drogbud.pl/Upload/file/vesusofubipibonewopujib.pdfIn PDF document text
    • https://bostaninsaat.com/image/files/vatuxadafaxeposux.pdfIn PDF document text
    • http://01host.ru/userfiles/files/nivif.pdfIn PDF document text
    • https://maviet.vn/upload/files/56360168327.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/60473424563.pdfIn PDF document text
    • http://dsagco.com/Upload/file/60168632805.pdfIn PDF document text
    • https://sardavetri.it/userfiles/file/fifowilalofojo.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/80227395292.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/97825392391.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/ratavalerepuriletef.pdfIn PDF document text
    • http://mkpstroitel.ru/upload/files/65827173180.pdfIn PDF document text
    • https://anzhero-sudzhensk.verlauf-ekb.ru/admin/ckfinder/userfiles/files/25479990899.pdfIn PDF document text
    • https://digireg.nz/upload/68406306111.pdfIn PDF document text
    • http://www.polni.si/Images/files/23562830567.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=disable+hardware+keys+androidPDF 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_off0000ede6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE6 10680 bytes
SHA-256: e4eea856ec72c96bae52ccecf39aebe67f5c486e7ac95cd618aeaaaa3bf51dd3
font_01_sfnt_off0001065e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011e70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E70 18368 bytes
SHA-256: 5c7c27b9ad19a28c6d2868f17da38e1fcdf51dc5c9dc97a75b0e19faa3b11be7

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