Malicious PDF — malware analysis report

Static analysis result for SHA-256 0d6667604c26ecc2…

MALICIOUS

PDF

32.6 KB Created: 2020-03-14 21:37:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: b13624baed02704f0d6877cdf75ca6b0 SHA-1: f0c0183e3eaa2e0ecb63d323895566bde6881b7a SHA-256: 0d6667604c26ecc2e7ed02a6793b32bd5bc4286065b60e783db3d49d40224ae3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of external links, many of which point to other PDF files with numeric slugs, suggesting a link farm or SEO abuse tactic. The document body, though partially corrupted, contains text related to 'subject verb agreement worksheets' and includes URLs that likely lead to the download of further malicious content. The ML classifier strongly indicated maliciousness.

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://www.giersberg.at/uploads/1/3/0/2/130288854/130288854.html#subject+verb+agreement+worksheets+word+doc
    • http://withfriendsinmind.com/uploads/1/3/0/5/130550655/2675305.pdf
    • http://perplexion.net/uploads/1/3/0/7/130776239/5175a808884c.pdf
    • http://readytoski.com/uploads/1/3/0/5/130545421/gemoputirewofe-fedetod-fozizojir.pdf
    • http://cockburnhouse.com/uploads/1/3/0/5/130542902/abe727b77a8079.pdf
    • http://warrenbsmith.org/uploads/1/3/0/6/130639091/xizik-legonaz.pdf
    • http://jolenesphotography.com/uploads/1/3/0/6/130605146/f764e.pdf
    • http://thefieldofpossibilities.com/uploads/1/3/0/7/130739711/xezasonel-bexeri.pdf
    • http://www.blindfirestudios.com/uploads/1/3/0/2/130271111/f7773.pdf
    • http://askthetutor.ca/uploads/1/3/0/5/130540559/sevaduluralek_bizobar.pdf
    • http://todoriper.com/uploads/1/3/0/4/130489567/8dfef029.pdf
    • http://www.ptownindie.com/uploads/1/3/0/5/130545565/ketizepax-miwerilage.pdf
    • http://www.stephaniemoskal-idt.com/uploads/1/3/0/6/130604305/5856651.pdf
    • http://citybusinessincubator.com/uploads/1/3/0/8/130813710/lamun-fezinuput-jikugo-gidifanafaf.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_off000057e4.bin
ff012bdd32481fac93c8b5d62ed72ef51b4201a94f5228c3cb2d93a9773b5766		 pdf-font-stream PDF embedded font (sfnt) at offset 0x57E4 7388 bytes

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