Malicious PDF — malware analysis report

Static analysis result for SHA-256 9df65b811bad34d5…

MALICIOUS

PDF

72.6 KB Created: 2021-09-12 05:23:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 8f65b776e2f8b9487bbf83e2a89cd892 SHA-1: 970f489af5012cc9de49b131e5c866e2567c5584 SHA-256: 9df65b811bad34d57e577f30a83d95b19075a72a66d0b82aa19ae0901b21c213
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it functions as a link farm. Numerous external URIs are embedded within the PDF, suggesting an attempt to redirect users to potentially malicious websites for phishing or malware delivery. The presence of `utm_term` parameters in some URLs further supports a phishing or spamming intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://krisoc.ru/uplcv?utm_term=space+jam+a+new+legacy+full+movie+online+free PDF link annotation
    • http://paykaaluminiya.ru/ckfinder/userfiles/files/44928098071.pdfIn PDF document text
    • https://sgotomotiv.org/upload/files/69795701757.pdfIn PDF document text
    • https://llibreriaha.com/img/events/file/jenanupogavukigekobofodox.pdfIn PDF document text
    • http://mrybalko.ru/files/kutosezugas.pdfIn PDF document text
    • http://www.oomedia.com.tw/ckfinder/userfiles/files/sinaposexunevakuwaj.pdfIn PDF document text
    • http://derkwoo.com/upload/editor/files/sirapijifoxovafugam.pdfIn PDF document text
    • http://sarigol.kr/userData/ebizro_board/file/35780549323.pdfIn PDF document text
    • http://kelvista.lt/images/files/lalologozirogeburevimok.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/gafibi.pdfIn PDF document text
    • http://petukmahaaaraj.com/userfiles/file/fedowumedinubisimukivuj.pdfIn PDF document text
    • http://pbpharm.com/upload/files/mibuxobivefapifadu.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/xawelesopokelewebitepi.pdfIn PDF document text
    • https://sbmhavacilik.com/userfiles/file/9873582900.pdfIn PDF document text
    • https://rotterdampools.com/contents/files/wovudimed.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/21419677732.pdfIn PDF document text
    • http://piri-piri.pl/ckfinder/userfiles/files/56742070821.pdfIn PDF document text
    • https://history.tlshaa.org.tw/ckfinder/userfiles/files/34861697265.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/gidirig.pdfIn PDF document text
    • https://h1t-urlaurora1-turbo.com/contents/files/mivafisanupozosexebo.pdfIn PDF document text
    • http://lnshiyue.com/userfiles/file/20210910090611_133853951.pdfIn PDF document text
    • http://bhartiyambeohari.in/userfiles/file/sewuritupesuvemuburunel.pdfIn PDF document text
    • http://interface-referencement.com/userfiles/file/63115045314.pdfIn PDF document text
    • http://fgsconsulta.com.br/ckfinder/uploads/userfiles/files/pifabe.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/32527574802.pdfIn PDF document text
    • https://bitree.com/ckfinder/userfiles/files/wekobinukaxupiragis.pdfIn PDF document text
    • http://goldcoil.com/uploadfiles/files/vogopotuvimegomosovu.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_off0000b90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB90A 11128 bytes
SHA-256: 3ffd275c812da260dbb1fb5daec0a41e7cb2e7b47156186bb33bf8ca67fab338
font_01_sfnt_off0000d30b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD30B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1D 16144 bytes
SHA-256: 3a3ca1d705fec72bf7af01ea6b29a1ae9360e7ffa928627472fec8e4ec84b2fe

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