Malicious PDF — malware analysis report

Static analysis result for SHA-256 196af9301eca779d…

MALICIOUS

PDF

57.9 KB Created: 2020-04-09 21:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 11099e021a77d044b9532f7d21835a34 SHA-1: 7534c73b392e4b934c7367e3ce766cf56faf91a7 SHA-256: 196af9301eca779d8fb48bb030889757d3202714ca103898d5f7b03e64788188
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous external links, many of which are structured as a link farm, suggesting an attempt to drive traffic to malicious or spam content. The document body, though obfuscated, contains a reference to 'Ccna 2 chapter 1 answers 2019' and includes URLs that appear to be part of a SEO spam or phishing campaign. The ML classifier also strongly indicated maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://dlparkerknives.com/uploads/1/3/0/6/130639810/130639810.html#ccna+2+chapter+1+answers+2019
    • http://ddrncboa.com/uploads/1/3/0/3/130313525/nelovasep.pdf
    • http://firmhousestudios.com/uploads/1/3/0/6/130605338/nubukepafuzo.pdf
    • http://thestereoshop.net/uploads/1/3/0/6/130639030/486763.pdf
    • http://friendsofjoetrillo.com/uploads/1/3/1/0/131070165/ccda8e249eac54.pdf
    • http://ofospremanltd.com/uploads/1/3/0/6/130605442/wugawunatijafakuxeg.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/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000a70f.bin
6c3438b433c7f7f940cf3c091dd3c45fca8177c9440959fa2f699b5009ea62b3		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA70F 8116 bytes
font_01_sfnt_off0000c685.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xC685 16036 bytes

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