Malicious PDF — malware analysis report

Static analysis result for SHA-256 f843b86999c06525…

MALICIOUS

PDF

32.5 KB Authoring application: Karbon
MD5: 555e585488180378fbc661bd01fa88df SHA-1: e9f711d69bdcd1ec701c15b81212ff1828069fcf SHA-256: f843b86999c06525b7d70279007baa50ec554f5d82bb56c1078779946191fa04
120 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file contains a large number of embedded URLs pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content, as suggested by the ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0'. The document body itself contains garbled text and some scientific terms, but the primary malicious intent appears to be the mass linking to external resources.

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://silkrainbow.net/uploads/1/3/0/5/130589077/vodifogone_zurimiziderepek.pdf
    • http://joanwills.com/uploads/1/3/0/8/130813934/3246871.pdf
    • http://abodonnellfitness.com/uploads/1/3/0/9/130969415/nalidewodeguni.pdf
    • http://www.stuijvesant.ch/uploads/1/3/0/8/130873783/3859707.pdf
    • http://www.newselfmagazine.com/uploads/1/3/0/5/130551257/8355414.pdf
    • http://soulspeakmarketing.com/uploads/1/3/0/5/130550871/6b18e20c.pdf
    • http://www.sing-llc.com/uploads/1/3/0/4/130483213/8913384.pdf
    • http://defenderofthemeek.com/uploads/1/3/0/2/130274109/fufekitin_kugesuza_lanor.pdf
    • http://premieraccountinsurance.com/uploads/1/3/0/7/130738939/sawava.pdf
    • http://amarbeck.com/uploads/1/3/0/7/130738855/7649780.pdf
    • http://thespeckledbird.com/uploads/1/3/0/6/130605420/kewagutelola.pdf
    • http://webmail.africansafariimports.com/uploads/1/3/0/7/130775917/zufosekelemawiw-fajikosoforad-merigi-dozinosibewuw.pdf
    • http://nextstepsdaycare.net/uploads/1/3/0/6/130620952/130620952.html#autosomal+dominant+vs+autosomal+recessive+definition

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000026d0.bin
ddde7f91856b1a501fc77ece207fd7d17de4c46a3d120176c4fc6f68367ca957		 pdf-font-stream PDF embedded font (sfnt) at offset 0x26D0 7908 bytes

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