Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f9d64150aa14cb…

MALICIOUS

PDF

43.7 KB Authoring application: Pdftk
MD5: e9fb1920a529059d9552684b59d67e6a SHA-1: eff3607238029ef742218ebddc53a9d782e619d8 SHA-256: f5f9d64150aa14cbfa93f3d42a8fed36a0d64ea1ef579ee8b869f1fa50caf3be
152 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The critical PDF_SEO_LINK_FARM heuristic indicates the presence of numerous embedded links, with the primary example being http://audiostart45.icu/uploads/2020/01/27/xafom_pijomaj.pdf. This suggests a phishing or malware distribution campaign where users are directed to external sites by clicking on these links.

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://audiostart45.icu/uploads/2020/01/27/xafom_pijomaj.pdf
    • http://myexplorelive.com/uploads/1/3/0/3/130313070/9611358.pdf
    • http://mifeleso.colorfulinkstudio.com/uploads/2020/01/28/peposujejukazat-mopibogusube-niroxupife-dixaxoran.pdf
    • http://metaconsultoriacondominial.com/uploads/1/3/0/6/130604022/dugasepibu.pdf
    • http://nooracademyonline.com/uploads/1/3/0/5/130547969/pukex.pdf
    • http://geo-leo.com/uploads/2020/01/29/takumunovologev-nizifaji-tudumidagonobog.pdf
    • http://necementshippers.com/uploads/1/3/0/6/130605452/7390215.pdf
    • http://drkerriesmedley.com/uploads/1/3/0/5/130545249/sarusuwaw.pdf
    • http://monashsoccerclub.com/uploads/1/3/0/5/130588263/95cec94fa610e8.pdf
    • http://dadekuso.firstcatering.ru/uploads/2020/01/27/8818510.pdf
    • http://aearthsport.com/uploads/1/3/0/2/130287890/wemawizipesari.pdf
    • http://xagiduboza.gate2019iitm.online/uploads/2020/01/27/2446fff.pdf
    • https://fipumafes.weebly.com/uploads/1/3/0/5/130543840/4182473.pdf
    • http://newelementkc.com/uploads/1/3/0/6/130621030/798526.pdf
    • http://mireillemanzone.com/uploads/1/3/0/3/130313585/mobasepazufivobi.pdf
    • http://misshufnagel.com/uploads/1/3/0/6/130604579/7980825.pdf
    • http://khv-gsm.ru/uploads/2020/01/28/7318023.pdf
    • http://psychicreadingsbyjohn.com/uploads/1/3/0/6/130620416/130620416.html#android+studio+gradle+build+too+slow

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001544.bin
45db92b737e5c80195e2e5345fd5fcba3e8e74864a3b56a3aa8aaeac768381a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1544 9368 bytes

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