Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c7bd7f3335eafcd…

MALICIOUS

PDF

72.0 KB Created: 2021-09-14 00:16:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 36da32236add876242c5f00eb64e0333 SHA-1: 7e557e56327b8b01424e7cf0bcea0822a7e2de04 SHA-256: 5c7bd7f3335eafcd910f230e7f5e19f3a808936ac641deea6993a08f86ec1550
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, suggesting a distribution or phishing campaign. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true malicious intent by using many distinct, low-reputation hosts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6691

Heuristics 4

  • 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
  • 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://www.dkmodels.net/ckfinder/userfiles/files/ruzunopid.pdf In PDF document text
    • https://chingchia.com/uploads/files/202109031254487256.pdfIn PDF document text
    • http://groupementpecheduloir.com/ckfinder/userfiles/files/viserologivebekobaji.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/wakekego.pdfIn PDF document text
    • https://sealordhotels.com/ckfinder/userfiles/files/junosop.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/wadigofabipadetevodis.pdfIn PDF document text
    • http://izr.fr/files/81907996431.pdfIn PDF document text
    • http://olimpic.hu/ckfinder/userfiles/files/fuzeza.pdfIn PDF document text
    • http://artechq8.com/beta/uploads/files/54619687687.pdfIn PDF document text
    • https://huuphongplastic.vn/uploads/images/files/39361261566.pdfIn PDF document text
    • https://accesoriosalmayor.com/images/userfiles/file/xesuvu.pdfIn PDF document text
    • https://stancijanegrin.com/UserFiles/files/66446110742.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/taderuvalixas.pdfIn PDF document text
    • https://nstyapi.com/resimler/files/96250610258.pdfIn PDF document text
    • https://onlineadda.organicemall.com/ckfinder/userfiles/files/vobutozeturubetakelazep.pdfIn PDF document text
    • http://fzsvybbs.at/userfiles/file/rupeteguwiwosu.pdfIn PDF document text
    • https://globalcircle.club/userfiles/file/mituradiwutixadotusejezes.pdfIn PDF document text
    • http://windowsplusllc.com/ckfinder/userfiles/files/xakar.pdfIn PDF document text
    • http://rgn2u.com/userfiles/files/pakosawebeliromudowifir.pdfIn PDF document text
    • https://wurstfargo.com/wp-content/plugins/super-forms/uploads/php/files/bf453dfdd8106ec3acc5d495999af318/judiseposopabu.pdfIn PDF document text
    • http://car-zone.sk/data/data/file/36288595596.pdfIn PDF document text
    • http://apothepharma.com/upload/files/lajovozeroj.pdfIn PDF document text
    • https://paramourpourbebe.bettygagne.ca/userfiles/file/lizoporepitagop.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=all+movies+web+series+apkPDF link annotation
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDC 19660 bytes
SHA-256: c8661efcb5808be5437cb9b3a07b7b3c225a80397b7f9f00335251300c1534a1

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