Malicious PDF — malware analysis report

Static analysis result for SHA-256 9d0881007838605a…

MALICIOUS

PDF

30.6 KB Authoring application: OpenOffice Draw
MD5: 0eff3c56849d69d0679031bacd309bd2 SHA-1: 3f8342423709bc4ee28684cf1494b659cdd4e2ec SHA-256: 9d0881007838605a8401786a62b315f73c0572aba292b64083453d240129bc57
150 Risk Score

Malware Insights

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

The PDF was flagged by multiple critical heuristics, including ClamAV and a machine learning classifier, indicating malicious intent. The primary attack pattern observed is a "PDF SEO Link Farm," where the document contains numerous embedded URLs pointing to external PDF files. These URLs are likely used to manipulate search engine rankings or to distribute further malicious payloads. No scripts were extracted from this sample, but the sheer volume of external links suggests a content distribution or SEO poisoning campaign.

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://birdhousepdx.com/uploads/1/3/0/2/130289735/daxew-rinudunulup.pdf
    • http://mosquesjobs.com/uploads/1/3/0/5/130589283/216876.pdf
    • http://parentsshopusa.com/uploads/1/3/0/3/130323697/supilijotitud.pdf
    • http://arkiv.rokus.no/uploads/1/3/0/5/130539114/pugakuxekara.pdf
    • http://christilsed.com/uploads/1/3/0/8/130813784/4be8413f519a0b2.pdf
    • http://bigislandpartyrentals.com/uploads/1/3/0/5/130540178/1713172.pdf
    • http://strongrootsfoundationmn.org/uploads/1/3/0/7/130775766/130775766.html#superlatives+worksheets+2nd+grade

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001082.bin
b3cf9ce72ef0f52c1999bc3f508b4f0ced21a057d66165b246c922294748b08f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1082 7720 bytes

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