Malicious PDF — malware analysis report

Static analysis result for SHA-256 779356f546c1e780…

MALICIOUS

PDF

30.2 KB Created: 2020-04-30 07:47:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 7f3cf9075cfbcde23ddecfefcfe7b9e3 SHA-1: 5192a487af2cc23e9ac6e813fa052838e00d3071 SHA-256: 779356f546c1e7802df7b45e487704581a1cc14a07e9e7a3dfcc4572911c7a7e
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to various domains, many of which appear to be part of a link farm. The ML classifier also flagged this PDF as malicious. The embedded URLs suggest a tactic to drive traffic to external resources, potentially for SEO manipulation or to serve further malicious content. No scripts were extracted, but the PDF structure itself is indicative of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://tarashollart.com/uploads/1/3/0/5/130551192/130551192.html#aaargh+normal+font
    • http://globalexpansionteam.net/uploads/1/3/0/3/130324004/679008.pdf
    • http://kasparianappraisal.com/uploads/1/3/0/5/130590191/netegowiborikin.pdf
    • http://patrickkarn.com/uploads/1/3/1/3/131398564/wiwonimatobudojek.pdf
    • http://stainlessinnovations.us/uploads/1/3/0/2/130289421/654012f4.pdf
    • http://lollienterprise.net/uploads/1/3/0/7/130776779/23aa555063.pdf
    • http://littletarzannkids.com/uploads/1/3/0/4/130488993/zapifaxijitaja.pdf
    • http://internationaledgroup.com/uploads/1/3/0/5/130551920/padasumib-vubebaxixizam-tofuwigi-balegijila.pdf
    • http://allfont
    • 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_off00004ba7.bin
65c7f556596a35f0a3b0ecc3817803c6a976052d543683fa08a8114bca3adc5d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4BA7 8860 bytes

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