Malicious PDF — malware analysis report

Static analysis result for SHA-256 ea5585129a975241…

MALICIOUS

PDF

70.7 KB Created: 2021-09-30 11:57:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 62aecff2c4db33fa5b7d65b744ca3c9c SHA-1: ef1498c101351ad829835c59e2b9fbe30df1c8a5 SHA-256: ea5585129a975241ceed9a5143296252c250c95cd0c5da26a5e9e9991c26040c
126 Risk Score

Malware Insights

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

The PDF was flagged by ML classifiers and ClamAV as malicious, with heuristics indicating it functions as a link farm. Numerous embedded URLs point to disposable hosting, suggesting an attempt to obscure the final destination, likely a phishing or malware delivery site. The `utm_term` parameter in one URL suggests a potential lure related to SMS/MMS on Android.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://jikaramen.com/uploads/files/wudimo.pdf In PDF document text
    • https://arrayamed.com/userfiles/file/67555612510.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109201425025069.pdfIn PDF document text
    • https://dpengineers.info/admin/userfiles/file/42788265132.pdfIn PDF document text
    • http://hanabi-la.com/uploads/files/nuxumakuwozejaxikumukuz.pdfIn PDF document text
    • http://boilerservis.ru/uploads/files/94504282391.pdfIn PDF document text
    • http://maroba-zirndorf.de/file/maregudasu.pdfIn PDF document text
    • https://marathonblainville.com/userfiles/files/52314338955.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021092613254273499.pdfIn PDF document text
    • https://umartravel.com/files/bodutewunavoro.pdfIn PDF document text
    • http://ukonlinedirect.com/userfiles/files/vuzomabatuziwisuw.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/55845278876.pdfIn PDF document text
    • http://koddous.com/userfiles/file/51753482399.pdfIn PDF document text
    • http://vishwkarmaenterprises.com/webroot/img/userfiles/files/23127097882.pdfIn PDF document text
    • http://tcgardening.com/userfiles/file/2021091601053273499.pdfIn PDF document text
    • https://alshamiltrading.com/alshamilfiles/file/32676394882.pdfIn PDF document text
    • http://depcip.com/app/views/panel/ckfinder/userfiles/files/37609059316.pdfIn PDF document text
    • https://thebottombillion.com/business_school/uploads/file/zumenokapaxu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/27408240030.pdfIn PDF document text
    • http://tnmetalworks.com/images/files/jarowugobazugutamojewitu.pdfIn PDF document text
    • https://guineaservicesproviders.com/gsp/files/sibiwebejakibofu.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/56017538428.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/ligamuku.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/97481337081.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/FevRqgeaUVY/uplcv?utm_term=sms+mms+androidPDF 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_off0000b33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000cb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB51 10208 bytes
SHA-256: 9d2e18bafcccc6818cf73255054d794fd9704e3bb17604a590d61674744d54d0
font_02_sfnt_off0000e20a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE20A 17024 bytes
SHA-256: 7da4a3c3ff4e617c8d9460726d934c9a6ac75ea1d01c8ec6f7a20eee2701e54b

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