Malicious PDF — malware analysis report

Static analysis result for SHA-256 17d164b230af053b…

MALICIOUS

PDF

71.0 KB Created: 2021-09-24 04:36:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5a153642a4f09a2eb639f88139245c33 SHA-1: eac2affcef77f60ea4a07da72c86812451c3ffc6 SHA-256: 17d164b230af053bb64d6fb0e5fa992010c25d7067eeaf9034c4b2490549aab5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users. The primary URL, 'https://inwebjor.ru/uplcv?utm_term=forgot+my+password+outlook+email', strongly suggests a phishing attempt related to password recovery. The ML classifier and ClamAV detection confirm the malicious nature of the PDF, likely serving as a lure for credential harvesting.

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 https://inwebjor.ru/uplcv?utm_term=forgot+my+password+outlook+email PDF link annotation
    • http://isystem.hu/userfiles/file/niwanasoxaxav.pdfIn PDF document text
    • http://jawarakreasi.com/file/76315391007.pdfIn PDF document text
    • https://samsungvrvklima.com/upload/ckfinder/files/67553853051.pdfIn PDF document text
    • http://tieulongcopro.com/luutru/files/67823436356.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/deresonewifi.pdfIn PDF document text
    • http://provia-events.de/pics/fotos/1/file/53173954018.pdfIn PDF document text
    • https://smilaxlabs.com/userfiles/files/xegivezuditu.pdfIn PDF document text
    • http://smolensk-bakaleya.ru/userfiles/file/51113964872.pdfIn PDF document text
    • https://maria-galland.ru/files/file/vowasanonebeleninekebutuz.pdfIn PDF document text
    • https://creativesilhouettes.ca/wp-content/plugins/formcraft/file-upload/server/content/files/161438e5b8009b---63132660487.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/96099120735.pdfIn PDF document text
    • http://ranahytta.com/ckfinder/userfiles/files/87792899547.pdfIn PDF document text
    • http://salsainkonstanz.de/media/files/nuluzol.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/koxoxuzurofep.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/84732650665.pdfIn PDF document text
    • https://doan295doson.vn/namthuan/images/news/files/59060974656.pdfIn PDF document text
    • http://suspensionestg.mx/userfiles/file/96718061093.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/jumoguwepired.pdfIn PDF document text
    • https://shatalarab-llc.net/userfiles/files/wiridakofelufe.pdfIn PDF document text
    • http://kooijobs.in/ckfinder/userfiles/files/noxezal.pdfIn PDF document text
    • https://srccaa.bdbabymart.com/app/webroot/ckfinder/userfiles/files/rofirunuwa.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b454.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB454 11000 bytes
SHA-256: 38cea40aca44450aff8d156a8114e604fc4ac788166c4274cebe3a56c835cb75
font_01_sfnt_off0000cdd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDD0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e5e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5E2 15860 bytes
SHA-256: f5c9b0ddcb9d536b4865a0e0c6717be9df700f4947998224b6a3e51449f68f8b

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