Malicious PDF — malware analysis report

Static analysis result for SHA-256 acca1ece76d7e84e…

MALICIOUS

PDF

83.2 KB Created: 2021-09-11 20:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 1a9c9f81cbf866a2fa13223ab37d2397 SHA-1: 9cdca06e0f4a06cbbad13a52305215ed85df20b0 SHA-256: acca1ece76d7e84eb4b899c52c8b890158155e3d57f2e2e5c3ab3bb6e786e1be
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. It uses an urgency-based lure. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://jowinbio.com/upload/files/202109071304349594.pdf In PDF document text
    • http://szguilong.com/userfiles/files/somajafari.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/5854355392.pdfIn PDF document text
    • http://geometrabottero.it/userfiles/files/zezexom.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903044725237008.pdfIn PDF document text
    • http://tulga.ru/editor/files/82206188260.pdfIn PDF document text
    • https://sidexsideaudio.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b513e7ef71---jedezurigapomegudoku.pdfIn PDF document text
    • http://bretagne.annuaire-regional.com/ckfinder/userfiles/files/buxasadaduvefukasa.pdfIn PDF document text
    • http://chongros.com/userData/board/file/tonakedafaja.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/29325391862.pdfIn PDF document text
    • http://nirmalapublicschoolerumely.com/userfiles/file/bavolarovisip.pdfIn PDF document text
    • http://debseven.net/UserFiles/File/16950738224.pdfIn PDF document text
    • http://petra-dario.info/upload/datoteke/21398013094.pdfIn PDF document text
    • https://angkortaxiservice.com/userfiles/file/29528050445.pdfIn PDF document text
    • https://mb-classic-service.de/userfiles/file/jusekovilujuxedetisow.pdfIn PDF document text
    • http://nd-58.ru/wp-content/plugins/super-forms/uploads/php/files/7b0bcd64ea4d8eb2010e0ebf45d1d561/87953501562.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/14489820693.pdfIn PDF document text
    • https://wotfiles.com/ckfinder/userfiles/files/89798424258.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/gakunanelogixidoba.pdfIn PDF document text
    • http://www.sanjuktabanerjee.com/fckimages/file/masubigon.pdfIn PDF document text
    • https://daqing-jewelry.com/uploads/files/202109042018234867.pdfIn PDF document text
    • http://4bzsoftware.com/Images_upload/files/94435859369.pdfIn PDF document text
    • http://charolais-hessen.de/write/userfiles/file/setavade.pdfIn PDF document text
    • https://mandarinkinesiska.com/userfiles/file/pugizepofapolivariloxod.pdfIn PDF document text
    • http://nadiadsa.org/userfiles/file/waxividixabap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/FevRqgeaUVY/uplcv?utm_term=the+dark+knight+full+movie+123moviesPDF 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_off0000dc1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1C 18508 bytes
SHA-256: 50403c19bb889f21d2e23e1c8bcd69f650b01871503bb67fd5e223cdf08827cd
font_01_sfnt_off00010c55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C55 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001246c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1246C 11364 bytes
SHA-256: f7e0079bdd62addedfd3275a7188c425fb703321e63dc221224ebd179a5b7374