Malicious PDF — malware analysis report

Static analysis result for SHA-256 ccf97b2bfa41f3ff…

MALICIOUS

PDF

40.9 KB Authoring application: Pdftk
MD5: c149ec1468673150f4beb81bb0353a26 SHA-1: 2c74d553d400094d110be0014df636c62719da69 SHA-256: ccf97b2bfa41f3ff185a1e469bdf1201ae60cb8d739cc9f4367d9db52f692af1
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by multiple heuristics, including ClamAV and a machine learning classifier, indicating malicious intent. The primary heuristic identified a large number of embedded external links pointing to PDF files on various domains, suggesting a link farm or distribution mechanism. The document body contained obfuscated text, and no scripts were extracted, but the sheer volume of external links points to a phishing or content distribution attack. The MITRE ATT&CK techniques T1566.001 (Spearphishing Attachment) and T1059.001 (PowerShell) are relevant due to the nature of PDF-based phishing and the potential for embedded scripts to execute commands, though no scripts were directly observed in this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://enem2023.com/uploads/1/3/0/6/130621059/nejigaxerasuro_vobako_vokewijezopo.pdf
    • http://www.digitaljammix.com/uploads/1/3/0/2/130291696/5406292.pdf
    • http://gloriaandfrederik.com/uploads/1/3/0/5/130588403/tixejot_jazawula.pdf
    • http://teknfix.us/uploads/1/3/0/8/130813429/vifijepunef-robazuxezabas-wikobajasufa.pdf
    • http://geminitrix.com/uploads/1/3/0/5/130543740/pidiwugunapu.pdf
    • http://neuromedica.org/uploads/1/3/0/4/130489006/3596849.pdf
    • http://bethevibration.com/uploads/1/3/0/7/130775841/foxodapifiku-jidaxowabu.pdf
    • http://sneaksneakgame.com/uploads/1/3/0/4/130435721/6587848.pdf
    • http://ecolevandyke.com/uploads/1/3/0/4/130475997/6760820.pdf
    • http://www.growingcommunitieshawaii.com/uploads/1/3/0/6/130621664/zujatefadu_xupixe_korudomoxowag_widipaz.pdf
    • http://newenglandpowerlight.com/uploads/1/3/0/7/130738647/povow.pdf
    • http://www.mustardseedkc.com/uploads/1/3/0/8/130874042/bidaxekenodet_zijavobiwevite_samamuv_vejokifurorasem.pdf
    • http://shadowbendtest4.com/uploads/1/3/0/6/130605383/vuvelegorisoka.pdf
    • http://flowersandcompany.ca/uploads/1/3/0/6/130621344/zonul.pdf
    • http://peekingpress.net/uploads/1/3/0/3/130313241/nufafot_wigafe_xezubikusefal.pdf
    • http://cairobritishcollege.com/uploads/1/3/0/5/130588611/888f50.pdf
    • http://www.cateuthanasiaathome.com/uploads/1/3/0/4/130436390/datovuzazudego-mutevojo-wolujixenona.pdf
    • http://millersgardenservicessuffolk.co.uk/uploads/1/3/0/5/130545557/titibijufuzutaregeg.pdf
    • http://whitefoxaccessories.com/uploads/1/3/0/6/130621744/zugekodexakaliwi.pdf
    • http://atoz2019.ca/uploads/1/3/0/4/130488152/taxogelabo-dojagak-fekitimeja-gitev.pdf
    • http://www.english-log-cabins.com/uploads/1/3/0/7/130775639/mokorixunuba.pdf
    • http://www.claybytracy.com/uploads/1/3/0/8/130813642/powubifikovosu.pdf
    • http://lukepetrosky.com/uploads/1/3/0/4/130488544/vufebijijume.pdf
    • http://annearundelhandcenter.com/uploads/1/3/0/6/130604203/xamaviwosiwo_moxufol_wekavonukifape_tokulekikeg.pdf
    • http://x0389813xstreamtravel.xsideas.com/uploads/1/3/0/7/130776208/130776208.html#indesign+export+pdf+file+size
    • http://www.growingcom

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003ad7.bin
bf002fd5a91fafcd534088d939f5a05c48d4ef97e0ad29809722a06478bd789e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3AD7 8296 bytes

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