Malicious PDF — malware analysis report

Static analysis result for SHA-256 da27e022d7774429…

MALICIOUS

PDF

39.4 KB Created: 2020-03-28 10:24:54 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0e67c050f0c4d30ffda17f86c94df056 SHA-1: 45eb7d8f06564f610d1a6fd6f974c75bf93fad32 SHA-256: da27e022d7774429fd13a01e1ae96f3f7b9802cb326edff7d83983fa9332c967
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 to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO poisoning attack, designed to drive traffic or distribute malicious content. The ML classifier strongly flagged this PDF as malicious. No scripts were extracted, and the document body was heavily obfuscated, limiting further analysis of the immediate intent beyond link distribution.

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://wellwithacupuncture.com/uploads/1/3/0/7/130738758/130738758.html#perimeter+of+shapes+worksheet+pdf
    • http://nickchaves.com/uploads/1/3/0/4/130488816/01452bc9.pdf
    • http://www.centennialvalleypoa.com/uploads/1/3/0/2/130272240/fc7accafbe0ba45.pdf
    • http://edoglobeteachers.com/uploads/1/3/0/5/130540037/xatotobolujazedemi.pdf
    • http://camacamp.org/uploads/1/3/0/7/130775431/b689e842fe.pdf
    • http://pausejudgement.com/uploads/1/3/0/2/130287738/kikosutudagig-dizadijaro.pdf
    • http://brazilianlohas.com/uploads/1/3/0/2/130272955/3d85358a13c.pdf
    • http://www.makingmusiconenoteatatime.com/uploads/1/3/0/3/130313657/rajuvemodevemuza.pdf
    • http://arightcar.com/uploads/1/3/0/6/130639500/fezosapizifo.pdf
    • http://tamarindoacupuncture.com/uploads/1/3/0/6/130603900/gufinozaliji-gezuge.pdf
    • http://ashleywilson.gallery/uploads/1/3/0/4/130436415/31566a4c0f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005eb1.bin
c7bccc761e55e74752e9c33aab685ad32d471edfe81b885491bdcab7497383c9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5EB1 7396 bytes
font_01_sfnt_off00007bbb.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7BBB 16036 bytes

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