Malicious PDF — malware analysis report

Static analysis result for SHA-256 f2f6c4288e7296d2…

MALICIOUS

PDF

71.6 KB Created: 2020-04-07 21:49:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1739e8181b1320446837676d9a0adbad SHA-1: fa567fd184d23fe71c0e06aa5227321451362c31 SHA-256: f2f6c4288e7296d236428f22da471d0e2b0ccd249a1c5c56504eee0f3b807588
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many of which point to other PDF files hosted on similar domains, indicating a link farm or SEO spamming operation. The primary attack pattern involves directing users to these external resources, which could host further malicious content or phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://newstylemarket.com/uploads/1/3/0/7/130776790/130776790.html#ediciones+castillo+examenes+bimestra
    • http://passmankade.com/uploads/1/3/1/1/131163617/rimeru-bifagavos.pdf
    • http://aspenvalleyassistedliving.com/uploads/1/3/0/6/130603835/wefedomejebifo.pdf
    • http://hostmaster.swanseaspeechandlanguage.co.uk/uploads/1/3/1/1/131163737/finudal-lepera.pdf
    • http://parkinharrisburg.com/uploads/1/3/0/6/130621905/sozim.pdf
    • http://comedybeastradio.com/uploads/1/3/0/6/130640078/132015.pdf
    • http://villageorgiamartinique.com/uploads/1/3/0/5/130590219/5224710.pdf
    • http://bspotlessllc.org/uploads/1/3/0/7/130739381/nakubexaniwobuvaw.pdf
    • http://singersandactorsworkshop.com/uploads/1/3/1/3/131384145/1486619.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ca88.bin
7df88723569d4193f530fe437fb919d713328a77de93ba1b94bee14e62ba1f6b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCA88 1712 bytes
font_01_sfnt_off0000d264.bin
a95236b38648a20e19c8d6b59391779ae9ef5324f69c7725219a1044237adc64		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD264 11704 bytes
font_02_sfnt_off0000fa33.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA33 16036 bytes

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