Malicious PDF — malware analysis report

Static analysis result for SHA-256 b76fabfaddf23ac3…

MALICIOUS

PDF

34.7 KB Authoring application: Karbon
MD5: 6c1c5f8004a61d07e118257134ce94d8 SHA-1: 820f33b5db0df53717737d0481caa93bf776cef6 SHA-256: b76fabfaddf23ac32f1b45cbd4da4f6bcf91dc79ab30b7ed8716237d49c1659c
120 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, a common technique for SEO poisoning and phishing. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malicious redirection campaign. The document body, though heavily obfuscated, contains text related to employment verification, suggesting a lure to trick users into clicking the malicious links.

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://mnnewfs.com/uploads/1/3/0/6/130621601/guzapuwij.pdf
    • http://www.garagedoorrepair-shoreline-wa.com/uploads/1/3/0/5/130588256/043091.pdf
    • http://hostmaster.mimf.co.uk/uploads/1/3/0/2/130291551/9d07cc85f99320.pdf
    • http://kimmietownsend.com/uploads/1/3/0/2/130273790/7676178.pdf
    • http://lizreflexology.com/uploads/1/3/0/7/130739369/dogiposixijusax.pdf
    • http://hostmaster.wacg.info/uploads/1/3/0/4/130435666/7460745.pdf
    • http://ntwstudioart.com/uploads/1/3/0/6/130620869/6218048.pdf
    • http://npcpasolutions.com/uploads/1/3/0/4/130489467/dejisazune.pdf
    • http://alyssup.com/uploads/1/3/0/6/130605426/vorotirap_dajesur.pdf
    • http://thehindireads.com/uploads/1/3/0/5/130550995/788500.pdf
    • http://0r8pu.salon225.com/uploads/1/3/0/7/130776699/130776699.html#to+whom+it+may+concern+letter+proof+of+employment

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003246.bin
5927767e146a215c1eedebf006811b0d44e9096899f2cee43b69d917c19439a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3246 7680 bytes

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