Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3b971fb440bcf59…

MALICIOUS

PDF

47.8 KB Created: 2020-05-31 18:54:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 1c4c23b45eba7bf32d2e7ff7c21b6d56 SHA-1: a0de876ff1d20662b55edffbb818b3cdaa0fe2e5 SHA-256: e3b971fb440bcf59e28f4336e82c19c752914fffc7344184c3e7cecd177856c8
94 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, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, many of which appear to be part of a link farm designed to manipulate search engine results or host malicious content. The ML classifier strongly indicated maliciousness, supporting the interpretation that this PDF is a delivery mechanism for further malicious activity.

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://mail.arikal.co.il/uploads/1/3/1/3/131378993/131378993.html#horizons+6th+edition
    • http://thebrilliantminute.com/uploads/1/3/0/2/130289315/widatejor_pajurabebo.pdf
    • http://autodiscover.hamilkerrchallenge.com/uploads/1/3/1/4/131437948/8910982.pdf
    • http://styledoesnotdefine.com/uploads/1/3/0/5/130544243/3654073.pdf
    • http://yourchinaguy.com/uploads/1/3/0/7/130739450/winepegag.pdf
    • http://kybercave.org/uploads/1/3/1/4/131452732/3455572.pdf
    • http://exceleratethepersonnu.net/uploads/1/3/0/8/130814132/xulunab.pdf
    • http://mylesgorham.com/uploads/1/3/0/6/130604225/8514c8c5d.pdf
    • https://wadedib.files.wordpress.com/2020/05/74699940517.pdf
    • https://ribixobu.files.wordpress.com/2020/05/89861212715.pdf
    • https://rusevaleno.files.wordpress.com/2020/05/jituges.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_off00008d2e.bin
19744ee4b45a8d50253b9dabb91ab6410c0dfbef4773d3457d11f7f358eeb1bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8D2E 11980 bytes

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