Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb3a55e2515c190…

MALICIOUS

PDF

33.4 KB Authoring application: pstoedit
MD5: dae9ece0490f6b875f35a07f925a1478 SHA-1: a6ba039f5d92771751202854e64737d972004e21 SHA-256: edb3a55e2515c19029b8e45fe370f712e175fbced53691f5765e60743622c0b1
150 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body mentions 'Darwin finches worksheet' and organizes worksheets by topic, suggesting a lure to disguise the malicious nature of the links. The primary malicious URL identified is http://oaktreecapllc.com/uploads/1/3/0/6/130639074/5725203.pdf. The ClamAV detection and ML classifier further support its malicious classification.

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://oaktreecapllc.com/uploads/1/3/0/6/130639074/5725203.pdf
    • https://fejesumepu.weebly.com/uploads/1/3/0/4/130435925/zerixirowakegex_mikisap_ronuzixeju.pdf
    • http://cruzlaminates.com/uploads/1/3/0/2/130289266/1b0c7c12d99.pdf
    • http://poshgroom.com/uploads/1/3/0/4/130436473/witoz-nimivol.pdf
    • http://tattnall4h.org/uploads/1/3/0/4/130435503/piwiwolivune_xilekusi_luvogiluzo_jeropisakufebax.pdf
    • http://yourpublicistknows.com/uploads/1/3/0/6/130621751/9797730.pdf
    • http://bandyphotos.com/uploads/1/3/0/5/130543239/130543239.html#darwin+finches+worksheet

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011ba.bin
e1c1a405ab352d3feca71025766d32ddd9b4a30689b1d75b005b01d6fcac85a6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11BA 9176 bytes

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