Malicious PDF — malware analysis report

Static analysis result for SHA-256 15fc806f89d81c67…

MALICIOUS

PDF

77.7 KB Created: 2021-10-06 01:15:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: b7258422dd617e9fded70b5d0f174d8b SHA-1: 5cf6f50ae6dac091004fcd17d18ee859fe585875 SHA-256: 15fc806f89d81c6748a53527366d8f8c0d28f5e810ef3b387f07294d7b9d8bab
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document's purpose is to host numerous links on disposable domains, a common tactic for distributing malware or conducting phishing. While no scripts were directly extracted, the PDF structure and numerous embedded URLs suggest an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9829

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://lucchetta.net/userfiles/files/13340123971.pdf In PDF document text
    • http://gasthaus-steinkirchen.de/img/editor/file/96701540484.pdfIn PDF document text
    • http://investin-khj.ir/ckfinder/userfiles/files/wotutenedi.pdfIn PDF document text
    • http://sirmamedia.com/ckfinder/userfiles/files/wakekego.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/zivuk.pdfIn PDF document text
    • http://hyunbulsa.org/~ewedd2/userfiles/file/rotixigasefirepopap.pdfIn PDF document text
    • https://gonguyenkhoi.vn/upload/files/20879213178.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/felapadomamegepikidubal.pdfIn PDF document text
    • http://zkqzl.com/uploadfile/file///2021092121285342.pdfIn PDF document text
    • http://birdwatching.sk/media/file/22684292586.pdfIn PDF document text
    • https://technok.cz/wp-content/plugins/super-forms/uploads/php/files/c97986ea09c980c35154799c7e28952d/badawozimerikuko.pdfIn PDF document text
    • http://nbc.com.vn/ckfinder/userfiles/files/90782846061.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/93152858850.pdfIn PDF document text
    • http://zlzljc.com/uploadfile/file///2021092918260381.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/kiwitujixizuxigilarivufa.pdfIn PDF document text
    • http://recviem.ru/img/upload/17391515410.pdfIn PDF document text
    • https://confidence-ist.mktechsol.com/ckfinder/userfiles/files/70868481187.pdfIn PDF document text
    • http://congluc.com/upload/files/67340302752.pdfIn PDF document text
    • http://dennehylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/razenidu.pdfIn PDF document text
    • http://meuble-tunisie.com/userfiles/file/tekadifalelewa.pdfIn PDF document text
    • http://onlineticketreview.com/images/file/wenidaxu.pdfIn PDF document text
    • https://educhina.mn/editor/files/notisekivijavom.pdfIn PDF document text
    • http://househouse.it/userfiles/files/gegazesuxebimibebulo.pdfIn PDF document text
    • http://bytip.net/filespath/files/20210919181051.pdfIn PDF document text
    • https://cezartravel.hu/userfiles/file/66055380388.pdfIn PDF document text
    • http://snp-ent.com/files/fckeditor/file/116245876614fb75452e9d.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=hairy+men+gay+moviesPDF 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_off0000c723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC723 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000df3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3A 10480 bytes
SHA-256: bd9ee129d5aea8459d86ee488fc9b9cfdb2e25d9e1329260d876fc56fbf490af
font_02_sfnt_off0000f6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6FF 19416 bytes
SHA-256: 4c40b6794c4bcd8f331daf762da91cc7ad4978d40bd0f9f1084715dc422a613b

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