Malicious PDF — malware analysis report

Static analysis result for SHA-256 d661841786ef60de…

MALICIOUS

PDF

36.0 KB Created: 2020-04-05 14:59:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 391205e2866f5d6d3609c79b160b72cf SHA-1: f73ede76316ffd159ed2b4d7dfc676c2638ddade SHA-256: d661841786ef60de0bcf226e10cd07ed6ab86349428abf6a164bf516f3258cec
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. The document body, though heavily obfuscated, contains URLs that are part of this link farm. The primary purpose appears to be directing users to a network of websites, likely for SEO spam or to host further malicious content.

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://jessicalgervaisbooks.com/uploads/1/3/0/5/130588165/130588165.html#geometria+euclidiana+plana+barbosa+pdf
    • http://lovesmystate.com/uploads/1/3/0/5/130589348/zodozebexuve.pdf
    • http://pozoper.pl/uploads/1/3/0/4/130489082/6068292.pdf
    • http://kingdom210.com/uploads/1/3/0/2/130274304/f77e4870d9a1c.pdf
    • http://5foot1ninja.com/uploads/1/3/0/4/130435873/95aa5317.pdf
    • http://mollymauied2013.com/uploads/1/3/1/4/131454304/2485966.pdf
    • http://overthetoprentals.com/uploads/1/3/0/8/130814754/mexokobubofoki.pdf
    • http://pointsonthewheel.org/uploads/1/3/0/2/130289179/wunenodamulaj.pdf
    • http://koshareeagleconsulting.com/uploads/1/3/1/3/131380627/ba61ab.pdf
    • http://contact.dng.ie/uploads/1/3/1/3/131378968/6402419.pdf
    • http://camden-care-nc.org/uploads/1/3/0/6/130605505/pogevinoku.pdf
    • http://neindigenousarts.org/uploads/1/3/1/4/131438059/kenekolopemovus.pdf
    • http://kcmobiledj.com/uploads/1/3/0/8/130874308/33fc3734b8455.pdf
    • http://onelegalaccounting.org/uploads/1/3/1/3/131383607/siwojatomoduleguk.pdf
    • http://redcoatpartners.com/uploads/1/3/0/7/130738715/5008498.pdf
    • http://garagecustomsbaitcompany.com/uploads/1/3/1/4/131413837/8997615.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_off00005f9f.bin
2a1709c5f731149230e5de66843339906ebcfd10eae8ca2f4e9fcbc9e72b9bea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F9F 9876 bytes

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