Malicious PDF — malware analysis report

Static analysis result for SHA-256 70573d0aff2f396a…

MALICIOUS

PDF

36.2 KB Created: 2020-03-14 16:43:16 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 4aec86eef8757c337906415a853c3447 SHA-1: f864f50fe2281318e31db40b47fad329cd851075 SHA-256: 70573d0aff2f396a2fabcf7f786a2454b09027483663585a62084e2a4ebfe0ee
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, indicating it is part of a link farm or SEO spam campaign. The document body, though partially obfuscated, references 'Logarithmic functions 2. 5 answer key' and includes URLs that are likely intended to redirect users to malicious sites. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a link-farming attack pattern.

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://genting-club.lucky1st.com/uploads/1/3/0/4/130483862/130483862.html#logarithmic+functions+2.+5+answer+key
    • http://mycrystallounge.com/uploads/1/3/0/5/130590525/boretagifux.pdf
    • http://sunshinerestaurant.ca/uploads/1/3/0/7/130738707/674186.pdf
    • http://shop.lawyerslendahand.org/uploads/1/3/0/2/130272609/kurib_jurafepilabobek_jofininawifutik_zarosovaxupelo.pdf
    • http://revenuemallorca.com/uploads/1/3/0/7/130776698/vipesifiwo.pdf
    • http://www.unholyspiritproductions.com/uploads/1/3/0/7/130739935/7492108.pdf
    • http://bbpci.org/uploads/1/3/0/7/130739837/474382d2ac4e6.pdf
    • http://o2smallhouse.com/uploads/1/3/0/6/130639926/3681279.pdf
    • http://majesticallips.com/uploads/1/3/0/6/130639400/binetejoxisusaka.pdf
    • http://epaphrasacademy.com/uploads/1/3/0/5/130588213/5756465.pdf
    • http://netherhaughfarm.com/uploads/1/3/0/6/130621873/wepomoveratufip.pdf
    • http://menusie.com/uploads/1/3/0/6/130603994/powupizevuvaj_datozileni_wufopalu.pdf
    • http://limousineinmillvalley.com/uploads/1/3/0/8/130814636/pabijew.pdf
    • http://careingpaws.net/uploads/1/3/0/4/130475932/1a0d4dc8634.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_off00006338.bin
3cee384ab9d9ee262bc4f1dd92343f3e1e57fd0a709c1dcd29cb119c3d07c586		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6338 8460 bytes

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