Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f11bea3ac357499…

MALICIOUS

PDF

37.8 KB Authoring application: OpenOffice Draw
MD5: 3604849cc91253491fe86fe091135c49 SHA-1: 98a56ff7eef737ab3277d7973e1555bfbd193de9 SHA-256: 4f11bea3ac35749939946a0b04a70d1694fdb2e1cb19d055f23f0efe16718e08
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, as indicated by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier also flag this as malicious. The document body, though heavily corrupted, contains fragments of URLs that are consistent with the link farm behavior. The primary purpose appears to be directing users to a large number of external PDF files, likely for malicious SEO or to distribute further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://stjamesya.org/uploads/1/3/0/4/130483263/wuvil.pdf
    • http://sabalu.posital-encoder.ru/uploads/2020/01/27/jubinud_kodureribemox_pewew.pdf
    • https://tidomezenu.weebly.com/uploads/1/3/0/2/130289352/32f61daa64631.pdf
    • https://kixujibij.weebly.com/uploads/1/3/0/3/130313453/wenidutapufamunokiwa.pdf
    • https://wuxapufugogibi.weebly.com/uploads/1/3/0/5/130542717/werazazebuk.pdf
    • http://ruditosi.russkond.ru/uploads/2020/01/29/1af7ea11609.pdf
    • http://treehousebellaire.org/uploads/1/3/0/5/130543310/butux-kixife-bibozeke.pdf
    • http://cafemostik.com/uploads/2020/01/27/505e2a8d136.pdf
    • http://zew.sietmexico.com/uploads/2020/01/27/3005885.pdf
    • http://santacruzishome.com/uploads/1/3/0/4/130483739/lirowupinasup.pdf
    • http://avtofinance.com/uploads/2020/01/28/mabojejotipekepak.pdf
    • http://drfranklinlevin.com/uploads/1/3/0/6/130604527/gugeliw.pdf
    • http://laurenpawelski.com/uploads/1/3/0/4/130483632/tonemilin-roxebajorogakex-pevagilibo.pdf
    • http://neokundalini.org/uploads/1/3/0/6/130603698/130603698.html#what+happens+to+myosin+during+muscle+contraction

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000013be.bin
92f3ad5f880b4a06525dcae158a9f2d7bdbf3a767bae4e86bafc1db580ce34b7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13BE 7712 bytes

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