Malicious PDF — malware analysis report

Static analysis result for SHA-256 85631414955d5021…

MALICIOUS

PDF

73.6 KB Created: 2021-09-19 18:59:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 9f9c674104a6a439c17f2f1ae72eb76f SHA-1: 1a20bf994c385972e49b9a833d386ff32cd33698 SHA-256: 85631414955d502116afdc9c2e02e16bcffedd3c7850e45e8104126a99b6ab89
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains a large number of embedded URLs, many pointing to disposable domains, suggesting a link farm or phishing lure. While no scripts were explicitly extracted, the PDF structure and the presence of numerous external links indicate an attempt to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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.
  • QR-code redirect lure medium SE_QR_LURE
    Document instructs the user to scan a QR code with a phone — consistent with QR phishing, but also common in legitimate documents
  • 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://global-brand.net/userfiles/files/75784471220.pdf
    • http://www.heksan.com.pl/file/tazipajarikivax.pdf
    • https://aymsoft.us/aym_image/files/rojejimepa.pdf
    • http://terredellamagnagrecia.com/userfiles/files/64662176538.pdf
    • https://songhongresort.com/img/files/333345366.pdf
    • https://bolahijau.com/contents/files/katemavumerotuzu.pdf
    • http://rayhovietnam.vn/upload/files/kiloxejivumutibilisasef.pdf
    • http://elcivan.com/admin/UserFiles/file/73907137762.pdf
    • http://bunny888.com/ckfinder/userfiles/files/61997406644.pdf
    • https://noukos.gr/wp-content/plugins/formcraft/file-upload/server/content/files/1613067a2804ad---zopixaginida.pdf
    • https://www.mppoa.cloudlinesystems.com/assets/ckfinder/userfiles/files/rafazonusawoduxova.pdf
    • http://controldellaves.com/app/webroot/arxius/file/gegazera.pdf
    • http://shijijiaming.cn/filespath/files/20210910190536.pdf
    • http://www.dawnrotaryclub.tw/UserFiles/files/10473954258.pdf
    • https://drbumbnursinghome.in/ckfinder/userfiles/files/52470220420.pdf
    • https://cabsfromheathrow.com/userfiles/file/71727086436.pdf
    • http://contextuae.com/resimler/files/9966710491.pdf
    • http://ljsmelt.com/upload/files/54572235673.pdf
    • https://jeevadhara.org/work/london/userfiles/file/60878360764.pdf
    • http://yeongwonenc.com/userfiles/file/bebizaxatif.pdf
    • http://www.pvvc.cz/files/33268464180.pdf
    • http://myoffice2561.sesao33.net/UserFiles/File/35878346540.pdf
    • http://www.ufolep-69.com/contenus/files/gomugumirotukape.pdf
    • http://associatedreclaimed.com/userfiles/files/85817531619.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BkSY9tpko7c/uplcv?utm_term=telegram+plus+android
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bd54.bin
4f35d4baf63ae2473c4214e487eb52d2096300ef9ea1eb8b01937296407c44b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBD54 16872 bytes
font_01_sfnt_off0000e8a4.bin
1c9066f9bce0137b2bf4e22a0babffa304d52794a134492120ef0dfe5520d5df		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A4 10700 bytes
font_02_sfnt_off000100e7.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E7 16792 bytes

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