Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37b16fd0d0ef299…

MALICIOUS

PDF

45.7 KB Authoring application: LibreOffice Draw
MD5: 2d484d9177d4ce3da4bbddaa93c6d8e4 SHA-1: 483d80fd6de32c82c594b97ad80430becf4273f6 SHA-256: d37b16fd0d0ef299d85bf303548782e929d3e021ca744d53a5e1a333480ad3c2
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent. The heuristic 'PDF_SEO_LINK_FARM' specifically identifies the mass linking behavior, with 'blacktheta.com' being the dominant host for these lures.

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://blacktheta.com/uploads/1/3/0/6/130621596/jejodawujiferoluxi.pdf
    • http://constructionfurniture.com/uploads/1/3/0/4/130476102/899e4e39d57.pdf
    • http://kahlonjicosmetics.com/uploads/1/3/0/2/130274091/3808692.pdf
    • http://judehayes.com/uploads/1/3/0/6/130621243/7c37c55e155.pdf
    • http://nelaalen.com/uploads/1/3/0/5/130539933/4e1fa.pdf
    • http://helenabperryfinancial.com/uploads/1/3/0/4/130490461/6088f19ecfb39af.pdf
    • http://craftyaction.com/uploads/1/3/0/6/130621909/devijile.pdf
    • http://granadapacificpublishing.com/uploads/1/3/0/7/130776366/gututekizepaf.pdf
    • http://www.sarahskeytosold.com/uploads/1/3/0/6/130639559/dujebig.pdf
    • http://aylestoneallotments.org/uploads/1/3/0/7/130775456/fenakozije.pdf
    • http://www.islaverdevacation.com/uploads/1/3/0/4/130488846/1045131.pdf
    • http://tiffinindia.ca/uploads/1/3/0/5/130551331/8d413fbcf3a3d.pdf
    • http://vilven.com/uploads/1/3/0/2/130289550/1c0e14.pdf
    • http://ianmalone.com/uploads/1/3/0/5/130589249/726361.pdf
    • http://rootedsunshinetraining.com/uploads/1/3/0/3/130313366/3810242.pdf
    • http://c024lm.bdgct.com/uploads/1/3/0/4/130435795/130435795.html#arduino+uno+power+supply+current

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000047b4.bin
cfb3357b20fb01955c1e4a0ed568c791e3a97db8f0fbaa18432a833eaa1d19da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x47B4 2828 bytes
font_01_sfnt_off0000549e.bin
281a5cf68b32007de0ec1fe2463c18a6402bcbca121af53d66b5dc3dd2cd82c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x549E 9204 bytes

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