Malicious PDF — malware analysis report

Static analysis result for SHA-256 c555a7ba8357bb80…

MALICIOUS

PDF

38.5 KB Authoring application: Karbon
MD5: 33451877a06ec6d16d098e01fa21fe9f SHA-1: b2b2afd25dc61c5635c471e15d314f2d6e931a7a SHA-256: c555a7ba8357bb80b0c328189cf01fe3dbe148e534d6bbce8a2d6610c7f2c543
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded links to external PDF files hosted on various domains. This behavior is indicative of a link farm or a phishing campaign designed to drive traffic to malicious content. The ClamAV detection and ML classifier strongly support the malicious nature of this file. No scripts were extracted from this sample.

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://mybest30minutes.com/uploads/1/3/0/5/130588846/176232d15077303.pdf
    • http://myoppconsulting.com/uploads/1/3/0/7/130776174/ponidipumotafisofubo.pdf
    • http://hostmaster.marilynobrien.co.uk/uploads/1/3/0/9/130969699/1481056.pdf
    • http://cerebromatics.com/uploads/1/3/0/7/130775295/5f4a18e4fd70f7.pdf
    • http://farmhub.online/uploads/1/3/0/3/130323392/eba07b39c55aa93.pdf
    • http://usmgsol.com/uploads/1/3/0/6/130639443/84ced1d0.pdf
    • http://webdisk.leabowskitchen.com/uploads/1/3/0/6/130620459/58f1d958f80426.pdf
    • http://antiqueteddybearcrossing.com/uploads/1/3/0/5/130544118/mosel-raregewad.pdf
    • http://www.karenjrohrlach.com/uploads/1/3/0/4/130488503/jufivariwenumefubijo.pdf
    • http://backandbarberingstudio.ca/uploads/1/3/0/4/130435532/bfcfcc.pdf
    • http://cyclorise.co.uk/uploads/1/3/0/4/130489933/luforitanezupevel.pdf
    • http://adamgoodbet.com/uploads/1/3/0/2/130291922/3ae88.pdf
    • http://cpsaltlakecity.com/uploads/1/3/0/4/130476447/9052415.pdf
    • http://ballroomalliance.com/uploads/1/3/0/7/130776349/juwezuxep-midefu-toxamazusiveme-nowaxidefosaseb.pdf
    • http://danwashburn.org/uploads/1/3/0/6/130620690/fepevaza-repijiz-rinotilunotizuv-mizapaxazupemeb.pdf
    • http://johnwshaffstall.com/uploads/1/3/0/6/130605442/4587333.pdf
    • http://mail.jammpublishing.net/uploads/1/3/0/6/130640104/a25ea6a51450.pdf
    • http://patriciajaggie.com/uploads/1/3/0/2/130272488/weloxifomepom.pdf
    • http://cvkhotel3.devsite-1.com/uploads/1/3/0/3/130323928/130323928.html#sds+gel+running+buffer+recipe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001ef4.bin
ed90a25b0f6931e3553f88bb9f804fd8fcbb8e43181ee20d2f66950d5413d4f3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1EF4 16132 bytes
font_01_sfnt_off00003691.bin
11425cc65ad720d1971fe076f0595a9b80a28d107fedb722bc39e475f49a3c83		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3691 8456 bytes

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