Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a8dd768291ff03d…

MALICIOUS

PDF

39.1 KB Authoring application: Karbon
MD5: f37773e29fa63336db872b03e0839164 SHA-1: ef465b810e81159545896a076ff0cd8d8f0a8030 SHA-256: 0a8dd768291ff03dd16f10050658f67475b230b60c8a66cfb09c9facbc942293
160 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, identified as a link farm, with the primary purpose of redirecting users to other PDF documents. The document body suggests a lure related to an apology for wrong information, aligning with the 'SE_INVOICE_LURE' heuristic. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to distribute further malware or phishing content via the embedded URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://barbaramars.com/uploads/1/3/0/5/130546024/1109625.pdf
    • http://colinbunn.weebly.com/uploads/1/3/0/6/130621619/6960310.pdf
    • http://localfrio.net/uploads/1/3/0/2/130273980/rodibej-vadiwubo-tetivixiw.pdf
    • http://kjfteak.com/uploads/1/3/0/2/130288514/folefifenagew-rejurotig-fupadujepam-muten.pdf
    • http://ride.trustnews.me/uploads/2020/01/28/8bf69.pdf
    • http://jeffreyvictor.net/uploads/1/3/0/2/130272390/zulanok_gotijer_rukipuvesu_zanubinimatel.pdf
    • http://nyingma-summer-seminar.com/uploads/1/3/0/6/130621162/gagezo-dumavi-zizuvu-fejoridudojot.pdf
    • http://cyclebavaria.com/uploads/1/3/0/6/130604694/130604694.html#apology+mail+to+customer+for+wrong+information

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011de.bin
1b2b26a15675a6ac726759d7d61a65c2684bc1838cad1d9c8d12d9881421eaf4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11DE 8092 bytes

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