Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f20c1b1bf5fa239…

MALICIOUS

PDF

34.4 KB Created: 2020-04-15 11:58:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3ebc10df8530ba4fdb904ffcd740deff SHA-1: 89f7e6bb7169a258208ec016b64fea042fbf97d3 SHA-256: 6f20c1b1bf5fa239444f8633b2bac75a091a62bc4acbc105ecd53bf15fc20a81
96 Risk Score

Malware Insights

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

The PDF contains numerous embedded links to external websites, many of which follow a pattern suggestive of SEO link farming or phishing lures. The document body, though partially corrupted, contains the text 'Exemption deduction worksheet', indicating a potential pretext for directing users to malicious sites. No scripts were extracted, but the high number of external links and the ML classifier's strong positive result suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://ugencoaching.com/uploads/1/3/0/3/130379894/130379894.html#exemption+deduction+worksheet
    • http://tadhgtactoe.com/uploads/1/3/0/3/130323510/rejorejev_bepirutalifola_waxubuwari.pdf
    • http://xn--l1ao9a.com/uploads/1/3/0/7/130776148/kijub.pdf
    • http://christophercodycooley.com/uploads/1/3/0/3/130313294/xajebanafep-funepex-tufasituv.pdf
    • http://nicoletteheather.com/uploads/1/3/0/4/130476456/878b1ab490.pdf
    • http://lolacaring4you.org/uploads/1/3/0/8/130815031/vurusibizomewobokan.pdf
    • http://awakeningtogetherglobally.com/uploads/1/3/0/7/130775245/44b1a705b4c5.pdf
    • http://bergeneducational.com/uploads/1/3/1/3/131380594/6172215.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_off0000606b.bin
9791ddad1f3b13f4e6dd88028c7b3fbbfcfdea415f657fc8e1662dd2bebf09c1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x606B 7552 bytes

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