Malicious PDF — malware analysis report

Static analysis result for SHA-256 a88dbc0a73a4d820…

MALICIOUS

PDF

62.8 KB Authoring application: Karbon
MD5: 04ab47058c8f54365607783464ce5e3e SHA-1: 3c3df93d4b4337d0734f971fca5925a4f789437a SHA-256: a88dbc0a73a4d8207997eafe179463698e5dafd89d90ef66b5d47114f0127119
150 Risk Score

Malware Insights

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

The PDF contains a link farm of external PDF files, disguised as a resource for English grammar books. This technique is commonly used to distribute malware or lead users to phishing sites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://doulajane.com/uploads/1/3/0/3/130379287/wezutuki.pdf
    • http://vectorservicesmn.com/uploads/1/3/0/4/130436093/2847138.pdf
    • http://mistyislandbernese.com/uploads/1/3/0/6/130639861/82dd16.pdf
    • http://beautybyellav.com/uploads/1/3/0/4/130435548/pedenibigup-dunivepa-megeseted.pdf
    • http://newyearswim.co.uk/uploads/1/3/0/5/130589227/a5862a95544.pdf
    • http://reelectjudgeericshepperd.org/uploads/1/3/0/4/130476468/rigifige.pdf
    • http://thankheaven.com/uploads/1/3/0/7/130775826/pipixewuzediwur-badadafatatawut.pdf
    • http://fenghuangtaiyangcheng.br3h.com/uploads/1/3/0/6/130639513/wujumaba.pdf
    • http://pmehard.com/uploads/1/3/0/6/130620979/8457133.pdf
    • http://anniebeg.com/uploads/1/3/0/6/130621195/pubotukif_vokidubisixoj_potumeju.pdf
    • http://8ccer.bpmtc.com/uploads/1/3/0/8/130874278/130874278.html#best+english+grammar+books+pdf+download

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006947.bin
1723f1ced37cc89d69e30f3df6281c5e5fb8989544fd4587aa75b00c91af2fd0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6947 1388 bytes
font_01_sfnt_off00007325.bin
30c0bcacc6b99cfa283ade5be9d4458afbce35a16c08b23f547fb45d393f63f6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7325 15776 bytes
font_02_sfnt_off00009fb5.bin
b0dc3ca91d23e1a8c7ba61ee4a2e7f1cee62b2746fa39f9f94ccdd00c2a86955		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9FB5 8444 bytes

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