Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d52078954e3aa66…

MALICIOUS

PDF

83.7 KB Created: 2021-09-17 17:25:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 7c9a2dfe6a9f0c8747dd8806d587fd97 SHA-1: 07e3722d29b67639dca628f048d9f9ef07ebbf92 SHA-256: 6d52078954e3aa66e9db834ce8506befa54208304b441a4b8575ae8a9e2a09f4
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF was flagged by ML classifiers and ClamAV as malicious, with high-severity heuristics indicating the presence of algorithmically generated URLs. The document body is heavily obfuscated, but the numerous external links suggest a phishing or malware distribution attempt. No scripts were extracted, but the PDF structure itself is used to host malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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://piemonteforyou.it/userfiles/file/97647858092.pdf In PDF document text
    • https://lorenzonimmigrationlaw.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139be1a61385---kunixevexifame.pdfIn PDF document text
    • http://wuyioutdoor.com/userfiles/file/76653906792.pdfIn PDF document text
    • http://broadgatecapital.com/userfiles/file/53767915839.pdfIn PDF document text
    • https://indoshaolinkungfusociety.com/ckfinder/userfiles/files/17173938239.pdfIn PDF document text
    • http://sakulchaiplace.com/Uploads/file/vaziwazabapepesumorepeb.pdfIn PDF document text
    • http://snuhonors.com/userfiles/file/49210523358.pdfIn PDF document text
    • https://wecareprogram.org/images/file/bavakudozuwivuvifiw.pdfIn PDF document text
    • https://ksi-system.pl/editorfiles/file/22903466852.pdfIn PDF document text
    • http://kingkady.cn/uploadfile/files/jasojebovitonuzik.pdfIn PDF document text
    • https://fibaquitaine.fr/cebatrama/userfiles/files/zolepafenodowifodiv.pdfIn PDF document text
    • https://desco.scp.hr/files/25398895326.pdfIn PDF document text
    • http://de.ruben.pl/ckfinder/userfiles/files/wimuvafisibefixogifuvu.pdfIn PDF document text
    • https://stthomasorthodoxchurchsouthpampady.com/userfiles/file/69317002878.pdfIn PDF document text
    • http://kenshopvn.com/uploads/files/99024922564.pdfIn PDF document text
    • https://maidintown.co.uk/wp-content/plugins/super-forms/uploads/php/files/69b7e920fcaabd28b1512dcfd4f3e3d9/6010009254.pdfIn PDF document text
    • https://spbmworld.com/anaeter_capital/siteadmin/userfiles/files/dibaxaxetotuvusovowip.pdfIn PDF document text
    • http://stilna-ya.com/_userfiles/file/74360591777.pdfIn PDF document text
    • https://pmfegypt.com/userfiles/files/timapawigapaxariranomedu.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/22303812927.pdfIn PDF document text
    • http://upakuika.com/img/file/32466798368.pdfIn PDF document text
    • http://klubbelgickychobrov.sk/editor_uploads/files/42013417944.pdfIn PDF document text
    • https://cantellodetersiviprofessionali.it/uploads/file/marusipemugopepazope.pdfIn PDF document text
    • https://gulfcans.com/home/madarmun/public_html/gulfcans/images/bulk_images/files/77750030718.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/negavokopakabugiberakeji.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=delete+dalvik+cachePDF 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_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fbce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBCE 17944 bytes
SHA-256: 08e41b59a3acb297e90e5ef628d5461681debfccce7c17fa5349c780d779bf5c
font_02_sfnt_off00012a52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A52 10132 bytes
SHA-256: 5a03fb129ab26234b7a60074567eac5437e7dda932c03e71feadd8947ef9baaf