Malicious PDF — malware analysis report

Static analysis result for SHA-256 f586c87497c7287b…

MALICIOUS

PDF

36.6 KB Created: 2020-05-15 13:40:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f9fa9d78942509a2abf00d8c5ed31e23 SHA-1: afde4de01f80c188a3861198ad6d67b9fb1851d9 SHA-256: f586c87497c7287b7079aca92d6228b41929de1fa904276d525bde3030be5b4c
94 Risk Score

Malware Insights

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

The PDF document is identified as malicious by an ML classifier and contains a significant number of external links, indicative of a link farm or SEO abuse tactic. The document body suggests a lure related to 'Entrance exam reviewer with answer philippines pdf'. The primary attack pattern involves directing users to a large collection of external PDF files, likely to distribute malware or engage in phishing. No scripts were extracted, limiting the analysis of direct payload execution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://pearlseattle.com/uploads/1/3/0/6/130639386/130639386.html#entrance+exam+reviewer+with+answer+philippines+pdf
    • http://redstreet-legalgolf.com/uploads/1/3/0/7/130740186/90e57e81.pdf
    • http://desaga.net/uploads/1/3/0/3/130323163/gatavafu.pdf
    • http://coveybrothers.com/uploads/1/3/0/6/130639407/6405782.pdf
    • http://filming-god.com/uploads/1/3/0/8/130814763/283afa054a83e60.pdf
    • http://whispersofheavengifts.com/uploads/1/3/0/6/130620764/xugijoloxir.pdf
    • http://pathwaystoyourpotential.com/uploads/1/3/1/4/131453520/6660184.pdf
    • http://hminspirations.com/uploads/1/3/1/4/131438268/95984072.pdf
    • http://ideasworkshopuganda.com/uploads/1/3/0/6/130620578/2e9443e7d.pdf
    • http://olivercook.com/uploads/1/3/1/3/131398084/fivijogexitegag-rokojixetapi-votozef-texubirobumogu.pdf
    • http://universaldentalcares.com/uploads/1/3/1/4/131482823/5750832.pdf
    • http://cometothewellcoaching.com/uploads/1/3/1/3/131380894/7927921.pdf
    • http://jillsimms.com/uploads/1/3/1/4/131409841/8150135.pdf
    • http://dbkstaging.com/uploads/1/3/0/5/130543006/jojisatulaxakuf-duvowakalovad-kegakekoz-junasisuvisep.pdf
    • http://teambuildingingeorgia.com/uploads/1/3/0/5/130589004/63b37dce.pdf
    • http://katherinetriantafillou.com/uploads/1/3/0/8/130873717/e2036d1c1.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_off000061ca.bin
04f655d174c42c08d80105139f2682e965483d2ff59a0d4978f76f48a54bbd5b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61CA 10780 bytes

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