Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb76ed03e6e39c6d…

MALICIOUS

PDF

78.9 KB Created: 2021-09-17 06:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: a6c4d2f214dac4d0584a7f3b0e58e991 SHA-1: 2d46eb9e6b3f56143bbc6c90f63f030b2b963f4f SHA-256: cb76ed03e6e39c6dca71b1dccde0e87245408badb96a5c2fb32e554377a49264
126 Risk Score

Malware Insights

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

The file was detected by ClamAV as Pdf.Phishing.Trojan and an ML classifier flagged it with high confidence. It contains numerous embedded URLs pointing to a link farm, indicating a phishing or malware distribution attempt. The PDF structure and the presence of multiple links suggest it's intended to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 https://pmsp-me.com/userfiles/files/77040050103.pdf
    • https://markyatirim.com/resimler/files/mefugoxixupimazipasaz.pdf
    • http://104408017.linker.tw/files/80654733369.pdf
    • http://ahcxdq.com/uploads/file/062145273963.pdf
    • http://videocycling.info/files/file/fejimipajinefoziz.pdf
    • https://baongochoa.com/upload/file/palizabodu.pdf
    • http://narzedziascierne.eu/Upload/file/vimub.pdf
    • http://qiuyutv.com/userfiles/files/20210904123816.pdf
    • http://gotoippc.com/ckfinder/userfiles/files/lutidubujuduwedete.pdf
    • http://lovec.bg/root/ckfinder/userfiles/files/60619135456.pdf
    • https://mantyobras.com/userfiles/file/93518074365.pdf
    • https://renesens21.com/ressources/upload/files/gajerasok.pdf
    • http://gyogytornasz.hu/editor_up/33245014820.pdf
    • http://ankaraeksioglu.com/resimler/files/50040921157.pdf
    • http://af.ssla.ru/images/fornews/files/37594826854.pdf
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132709d2a665---56678952226.pdf
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/sewimowufozanevozop.pdf
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/16140035d04c7a---mozewisilesosigen.pdf
    • https://matraci.info/UserFiles/File/ginivepazamulifajigemo.pdf
    • http://espicycooking.com/files/file///gosipawutowon.pdf
    • http://leoclubmarsala.it/userfiles/files/pabozilaxatenudunovofiza.pdf
    • http://thingsantiquesla.com/userfiles/files/dixizojuxubuzixijamorige.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=random+ads+popping+up+on+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_off0000d22f.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 16792 bytes
font_01_sfnt_off0000ea46.bin
eb1e943c92faf313a02218fe8abc0169b1da8d4657b979ce6b4df7422216a694		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEA46 10604 bytes
font_02_sfnt_off0001022d.bin
4c9c12d957ca6c649796130c39219bddbb64b3992798bf04e63977b340e7dfff		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1022D 16732 bytes

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