Malicious PDF — malware analysis report

Static analysis result for SHA-256 67a8e165aa36d81a…

MALICIOUS

PDF

70.9 KB Created: 2021-09-17 19:11:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4648bb4b0346465ba4c5026bd7259c58 SHA-1: bae9a03e2bd95e3345ffbb7e5df637032e02a860 SHA-256: 67a8e165aa36d81ae7263853ef67709254e7e13844aab5fa3cf5da937c0930e3
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as a malicious PDF by ClamAV and an ML classifier. It contains numerous external links, many pointing to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a pattern of using disposable hosting for these links, common in phishing or malware distribution campaigns. No scripts were extracted, but the overall structure and heuristics point to a phishing or malware delivery attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://cemb.ca/upload/editor/file/39195384397.pdf In PDF document text
    • http://formpart.com/upload/ckfinder/files/bapapu.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/7011529121.pdfIn PDF document text
    • https://gbagencement.fr/uploads/file/naxavenefexere.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/161404655b7fac---29551786915.pdfIn PDF document text
    • http://life-worldwide.org/assets/uploads/files/32988935461.pdfIn PDF document text
    • https://mamap.in/ci/userfiles/files/golugosoka.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/27386473274.pdfIn PDF document text
    • https://searchkar.com/ci/userfiles/files/mivupakulezu.pdfIn PDF document text
    • http://scea.edu.mn/ckfinder/userfiles/files/20150221076.pdfIn PDF document text
    • http://newbiesites.com/userfiles/file/61051643720.pdfIn PDF document text
    • https://www.poolsrus.com.au/application/third_party/ckfinder/userfiles/files/33795031234.pdfIn PDF document text
    • https://winstar-tools.com/UserFiles/editor/file/jogemeguxe.pdfIn PDF document text
    • http://bienbao.net/uploads/files/66087821378.pdfIn PDF document text
    • http://nickels.design/ckfinder/userfiles/files/xoganareduvita.pdfIn PDF document text
    • http://prefinancovaniehypoteky.sk/res/file/xiwotal.pdfIn PDF document text
    • http://birizgardenhotel.com/userfiles/file/rewuxatelekarare.pdfIn PDF document text
    • https://dansobentre.net/uploads/file/govokamumuwilabaz.pdfIn PDF document text
    • http://chapelguild.com/images/usr/19506734481.pdfIn PDF document text
    • https://alwillislifecenter.org/ckfinder/userfiles/files/59133627439.pdfIn PDF document text
    • http://goldenstarhotel.vn/images/uploads/files/jekavu.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210905_08ADBF969F5AF04D.pdfIn PDF document text
    • http://camdohungdung.com/upload/files/82228338341.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=aa+ab+laut+chalen+full+moviePDF 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_off0000b212.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB212 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA29 10620 bytes
SHA-256: 3b3ae04696ab00d5c7ac0feea914f6eacef6d552788a214400ed3b6a2c427827
font_02_sfnt_off0000e24d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE24D 16980 bytes
SHA-256: 5971fba88d73a3461c3032d5d6c6294002c909e7c03f90743af02b2d0ca8ac1a

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