Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5393429ebf6c0a6…

MALICIOUS

PDF

42.8 KB Authoring application: QPDF
MD5: c218985bcaa3da6d9bb784ebfe8ecb43 SHA-1: 754b8f3e985bcd9e90c149e5ff9214e66edc66dd SHA-256: a5393429ebf6c0a6853600d9abf1b15096e7ddc73fb396997b99adc79f6104b6
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF was flagged by multiple heuristics, including ClamAV and an ML classifier, for malicious content. The PDF_SEO_LINK_FARM heuristic indicates the presence of a large number of external links, with the first being http://ztkarl.com/uploads/1/3/0/2/130272925/847d420a586d5.pdf. This suggests the document's primary purpose is to act as a lure, directing users to a network of potentially malicious PDF files.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ztkarl.com/uploads/1/3/0/2/130272925/847d420a586d5.pdf
    • http://mobilebillboardsoakland.com/uploads/1/3/0/6/130620207/kumubezawalotuk_resadijexiwol_managizoxuwoxiv_bilesusata.pdf
    • http://lifeinsurancelaverne.com/uploads/1/3/0/5/130588403/1d9a5fa863a2.pdf
    • http://calluponthename.com/uploads/1/3/0/6/130621765/fff1939b6e28.pdf
    • http://movmentlab.com/uploads/1/3/0/6/130621077/pufimevogeb.pdf
    • http://assessmentsystemscorporation.com/uploads/1/3/0/4/130489669/4f221c.pdf
    • http://stevejager.com/uploads/1/3/0/2/130288465/likugedul.pdf
    • http://nationalriskmanagementgroup.com/uploads/1/3/0/2/130287521/130287521.html#barrier+meaning+pdf

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001304.bin
8c09ec09060b7d2e4abe5ed8abc528df1bf009e67a5de693458b823ed1560a75		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1304 9012 bytes
font_01_sfnt_off00005723.bin
0396f977e54408ea50e48a2d8e7031fca21404bca11cfb2701b3d1b3753e4867		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5723 16236 bytes
font_02_sfnt_off00006c3a.bin
63f5e27ee3d24cc00d413e59c301cc73ab377383609796993547673f2bea898c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C3A 2600 bytes

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