Malicious PDF — malware analysis report

Static analysis result for SHA-256 98dd441be8eb527f…

MALICIOUS

PDF

83.0 KB Created: 2021-09-21 05:09:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f7edda1b95354227be9b2cd9031145fd SHA-1: cb332145e0a6c7ab2101d6f937022a09beed3d4b SHA-256: 98dd441be8eb527f470482c2a328dd7a9bf16df92239ebbf2a77d3b820c7b28a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm on disposable hosting. The embedded URLs point to various PDF files hosted on potentially compromised websites, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the structure and URL patterns are indicative of a common PDF-based attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

Heuristics 5

  • 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
  • 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 https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134b7425ca7c---65682439761.pdf In PDF document text
    • http://abdon.madteam.net/ckfinder/userfiles/files/48724358176.pdfIn PDF document text
    • http://schokobrunnen.com/idata/49435348786.pdfIn PDF document text
    • http://batistar.fr/userfiles/file/35011737534.pdfIn PDF document text
    • http://mega-gold.com/userfiles/files/nukomiduzexabet.pdfIn PDF document text
    • http://mwflower.com/upimagesfile///31226942590.pdfIn PDF document text
    • https://sunridgecorp.com/uploads/files/202109041842266732.pdfIn PDF document text
    • https://szabobuszrendeles.hu/files/files/47533446049.pdfIn PDF document text
    • https://funcarele.com/ckfinder/userfiles/files/62237330098.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-3/20210903101819458630.pdfIn PDF document text
    • http://divorce-difficile.fr/userfiles/file/xojizupulixi.pdfIn PDF document text
    • https://trinityautorepairs.com/uploads/files/68571680597.pdfIn PDF document text
    • https://thefertilizergranulator.com/d/files/85404772852.pdfIn PDF document text
    • http://vxclouds.com/userfiles/file/gegogofuvananax.pdfIn PDF document text
    • http://poledance-chrudim.cz/files/file/felelefetaxobetasoleje.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/99148248321.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/23203922438.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/xekajesegitij.pdfIn PDF document text
    • http://chelseafoodmart.com/uploads/files/pimixewoga.pdfIn PDF document text
    • http://waycreon.net/bhaskar/yii/upload/files/832522942.pdfIn PDF document text
    • http://arohitourandtravels.com/userfiles/file/zikefabozilatanemurubi.pdfIn PDF document text
    • https://www.davidwoodpersonnel.com/wp-content/plugins/formcraft/file-upload/server/content/files/161405deb78f55---bokoleteveb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=how+uninstall+system+apps+without+rootPDF 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_off0000e01a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE01A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f82c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF82C 17756 bytes
SHA-256: 514e5489096e2e981ab89f74ac0432f042fd5b1721c349aa35ec5cf5efaab050
font_02_sfnt_off00012596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12596 10808 bytes
SHA-256: 9f52a486f3bab643117d29f12bdcf81ff9ba22839bc977af75b5798c1da09297

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