Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fbf5504d1c9e5a5…

MALICIOUS

PDF

45.4 KB Authoring application: Karbon
MD5: f235e093c9d9621fde5571ed3b001f66 SHA-1: 5b3ec1777058d987403995d5dd4f10f8c4497b2b SHA-256: 4fbf5504d1c9e5a53726fb310158fa5eabdb5544c55ce2621a89ba9348cbd26b
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule, indicating a large number of external links. The ML classifier also assigned a high probability of maliciousness. The embedded URLs point to various PDF files hosted on different domains, suggesting a link farm designed to distribute malicious content or redirect users to phishing sites. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine a more specific attack pattern beyond link-based redirection.

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://bannerch.org.tw/uploads/1/3/0/4/130488228/sanabawivinugegi.pdf
    • http://grouperdate.com/uploads/1/3/0/5/130539492/8340044.pdf
    • http://myrocketflow.com/uploads/1/3/0/5/130550760/naxewunowuwemus.pdf
    • http://joyhaines.com/uploads/1/3/0/2/130291676/2694282.pdf
    • http://fourthtouch.com/uploads/1/3/0/5/130590702/bubivefus_batakujejip_risolujutisu.pdf
    • http://ezyfix2u.com/uploads/1/3/0/5/130551745/walim.pdf
    • http://hannah-swain.com/uploads/1/3/0/2/130270997/jepored.pdf
    • http://orphancaresolutions.com/uploads/1/3/0/7/130739583/4584797.pdf
    • http://jeffmcmahan.net/uploads/1/3/0/7/130739916/d5b489.pdf
    • http://noblocky.com/uploads/1/3/0/6/130620912/wubabed.pdf
    • http://imyanmarproperty.com/uploads/1/3/0/6/130604546/8330922.pdf
    • http://micasitarentals.com/uploads/1/3/0/5/130588360/tufemekon_fenum_daperefu_mokapixep.pdf
    • http://vinnybell.com/uploads/1/3/0/4/130436050/5a8d2dfb515.pdf
    • http://antiviruseprotectserviceonline.site/uploads/1/3/0/4/130490078/130490078.html#water+cooling+tower+experiment

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004660.bin
2cf02760782852e2979c2c2192136b6d1e3f302581bdf7693abe1e7da3bd56a8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4660 6484 bytes
font_01_sfnt_off00005912.bin
778a91729636e6a106eb65a92bd58698aad80dbb8c4c7ec13db642c99bf11dea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5912 8072 bytes

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