Malicious PDF — malware analysis report

Static analysis result for SHA-256 18b3c56f121fefd0…

MALICIOUS

PDF

27.9 KB Created: 2020-05-21 19:46:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 648dd2333851cf8f689d4b31f4259f1a SHA-1: e22f97d9752db97747b2973cea9363a0849ea1bb SHA-256: 18b3c56f121fefd0f14e1034846f4a3e75f818dc6417eafe59132c42a0855d40
96 Risk Score

Malware Insights

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

The PDF document contains numerous links to external PDF files and HTML pages, indicative of a link farm or phishing lure. The document body text explicitly mentions 'Avast flash player update', suggesting a social engineering tactic to trick users into clicking the embedded malicious URLs. The ML classifier also strongly flagged this PDF as malicious.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9962

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://atelierjademyr.ca/uploads/1/3/0/8/130874617/130874617.html#avast+flash+player+update
    • http://unmannedoilfield.ca/uploads/1/3/0/5/130539553/3185917.pdf
    • http://quailbreeders.org/uploads/1/3/1/0/131071073/vavasefolurigizub.pdf
    • http://brookebarberfit.com/uploads/1/3/1/3/131398181/3911041.pdf
    • http://tallangattatimbers.com/uploads/1/3/1/8/131856627/9418551.pdf
    • http://abundantlyenough.com/uploads/1/3/0/5/130590244/112352.pdf
    • http://11utct.com/uploads/1/3/0/7/130776104/buvavemovubelawu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000044ae.bin
09fb574c4726e33516c39f48fe9e1e550d6923ef90cd6690676f55d3120616dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x44AE 9460 bytes

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