Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e2da9b569952b4…

MALICIOUS

PDF

47.6 KB Created: 2020-04-16 17:45:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 55bb891651aa28005f71cae0c2c0b345 SHA-1: d0ccb863700ade240d75c649fb2db214345d28b4 SHA-256: 33e2da9b569952b44558d30c94e45caac23c1dd98f8b8d05aa441eb554176344
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, identified by the 'PDF_SEO_LINK_FARM' heuristic, pointing to various domains. The document body, though partially corrupted, includes the text 'Hard comprehension worksheets' and a URL, suggesting a lure to external content. The ML classifier strongly indicated maliciousness, and the presence of many external links suggests a distribution or phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9988

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://mcatgent.org/uploads/1/3/0/5/130544898/130544898.html#hard+comprehension+worksheets
    • http://dwaynerealestatedeals.com/uploads/1/3/0/5/130545096/zusaparar.pdf
    • http://cortiselectrical.com/uploads/1/3/0/5/130551772/6161093.pdf
    • http://thebrowngirltalks.com/uploads/1/3/0/2/130289209/bagalavurujezoli.pdf
    • http://muslimahbasics.com/uploads/1/3/0/5/130551486/3db477806a.pdf
    • http://tammykjohnson.com/uploads/1/3/0/6/130604981/wonamal-ladusewowezo.pdf
    • http://doctorsoncall.org/uploads/1/3/1/1/131163774/6a9fe6419c.pdf
    • http://bridges2magic.com/uploads/1/3/0/4/130493143/3407183.pdf
    • http://usfnforum.org/uploads/1/3/0/5/130541688/gafovavi-jogofo-lolavufojivan.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_off0000924e.bin
b2598d5083e9822f88573ebbb2d109bb694dbabc20fa5bb8b49cafc598d0cb2a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x924E 8008 bytes

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