Malicious PDF — malware analysis report

Static analysis result for SHA-256 719b5954085e6216…

MALICIOUS

PDF

37.5 KB Created: 2020-03-27 05:38:18 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: bf75f70381f1fa3693005b675e8f2507 SHA-1: ec2c435737cd49b9cc799caef2a85cae0e8ce3c5 SHA-256: 719b5954085e6216318c8b22e7cd5054bb661d6eacd095778ae57d612b8d35d3
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of external links, many of which point to other PDF files hosted on various domains. This behavior is indicative of a link farm or SEO manipulation tactic, potentially used to distribute malicious content or pages. The ML classifier strongly flagged this PDF as malicious, supporting the suspicious nature of the link farm.

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://teshuvah.international/uploads/1/3/0/8/130814584/130814584.html#excel+vba+a+beginners%27+guide+by+rajan
    • http://datasimplicitylabs.com/uploads/1/3/0/7/130775278/jibebanudej.pdf
    • http://mountaintopterrier.com/uploads/1/3/1/0/131071253/kafinozevegawogep.pdf
    • http://worldcheaptour.com/uploads/1/3/0/6/130603747/7962852.pdf
    • http://legacychoreo.com/uploads/1/3/0/4/130435876/ae89168.pdf
    • http://maximusboats.com/uploads/1/3/0/7/130739731/9459166.pdf
    • http://cdn-1.moneyhub.co.nz/uploads/1/3/0/6/130604564/b340f0.pdf
    • http://foleysv.co.uk/uploads/1/3/0/5/130551106/pazuf.pdf
    • http://j1st.org/uploads/1/3/0/9/130969722/zabig-bomubotas.pdf
    • http://reikitampabay.com/uploads/1/3/0/3/130379844/6c2740.pdf
    • http://scuhawaiiclub.com/uploads/1/3/0/2/130288626/magemagadi.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_off0000666c.bin
130c649aa8573f2937acf9e730b05cf3e23116a7e99b7ad7655e734bab3e4cf5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x666C 8640 bytes

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