Malicious PDF — malware analysis report

Static analysis result for SHA-256 97ea69fa074d7c1b…

MALICIOUS

PDF

34.2 KB Created: 2020-04-06 09:01:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f2523375b04cedaac41a329cfc1f3075 SHA-1: b8ebc10e19949e43dd3975f2cea4bd5586b3d540 SHA-256: 97ea69fa074d7c1bc03e40e736672000a547c2ac21ef388339397a9190447fd4
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDFs hosted on similar domains. The document body, though corrupted, contains text related to a math textbook and the wkhtmltopdf application. This suggests a link farm or SEO poisoning tactic designed to drive traffic to potentially malicious content. The ML classifier strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 4

  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://thetimetravelpundit.com/uploads/1/3/0/7/130738576/130738576.html#libro+de+quinto+grado+matem%C3%A1ticas+contestado+2019
    • http://1stclassgrass.com/uploads/1/3/0/4/130488914/c632b1.pdf
    • http://mygypsyrootscatering.com/uploads/1/3/0/4/130483912/52356464ef.pdf
    • http://docu-plus.com/uploads/1/3/1/4/131437953/fusur_powiwajagivebu_fokivo.pdf
    • http://edcovikings.com/uploads/1/3/0/4/130475996/zopedaju-lotuso-juvavonozibu.pdf
    • http://firstbaptistoakdale.org/uploads/1/3/0/9/130969445/mijegageveduza-sulezavaxo.pdf
    • http://lithoniaamphitheater.com/uploads/1/3/0/7/130739198/zitobon.pdf
    • http://nationalarenaswimmingleague.org/uploads/1/3/0/5/130588452/9150949.pdf
    • http://cougarspray.com/uploads/1/3/1/4/131454237/piremide_jamagamojalipi_famenotigu.pdf
    • http://starfrontweb.com/uploads/1/3/0/8/130814706/4813942.pdf
    • http://daysgonebuyjewelry.com/uploads/1/3/0/7/130775800/fozojezozur_sabufe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005aa2.bin
d0e7f6859030c4e5513416b78ab4b0c4f4a39b9e9efe30a5cad8ce95afd955f4		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5AA2 8548 bytes

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