Malicious PDF — malware analysis report

Static analysis result for SHA-256 21187a0734da0db3…

MALICIOUS

PDF

44.0 KB Authoring application: GIMP
MD5: 9d7a0dcc53ca779a355267639d80cd90 SHA-1: d42d0d3f6fd47e8202be9e3c4ec54ef1925a6703 SHA-256: 21187a0734da0db335837e8a5f63bb4faf3a21d67b1b0bfe513f22250f1e52eb
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO spam or to distribute malicious content. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier's high confidence score further support the malicious nature of this document. The document body itself contains references to 'Cambridge ielts listening test 6 answers' and a URL, suggesting a lure for educational material that redirects to potentially harmful content.

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 https://www.easy-ielts.com/wp-content/uploads/2020/01/CAMBRIDGE-IELTS-6-listening-test-3.m4a
    • http://muso101.com/uploads/1/3/0/6/130639591/fugoliwa_bobus_domasunalezir_purizalapom.pdf
    • http://ishiro.com/uploads/1/3/0/6/130639831/1245523.pdf
    • http://myslotweb.com/uploads/1/3/0/5/130545681/narobunafu.pdf
    • http://yourprofessionalheadspace.com/uploads/1/3/0/7/130775780/tezejiv-dedox-supifaz-fadilonisedi.pdf
    • http://jakeencinas.com/uploads/1/3/0/4/130488486/wutanimegi.pdf
    • http://powerwashsystems.net/uploads/1/3/0/5/130539097/tugetile.pdf
    • http://ardsleylatin.org/uploads/1/3/0/5/130588268/7151282.pdf
    • http://ciicus.org/uploads/1/3/0/6/130639306/jotizifig-mivumu-tadawuxovipa.pdf
    • http://greenlandretail.com/uploads/1/3/0/6/130620524/eaa6a.pdf
    • http://bsa-sccc-pack301.com/uploads/1/3/0/2/130287852/130287852.html#cambridge+ielts+listening+test+6+answers

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000123a.bin
b2405a5f2cd2770a366278a414e32f9cfbd6f5b26f6f7d4d055e8441464011b2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x123A 8496 bytes
font_01_sfnt_off000063cc.bin
a46acbcdfce5fd1a4aee4b65d71e64e1a98805c78bad6f675c4e3befb6055cdd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x63CC 16484 bytes

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