Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b48963cb227d487…

MALICIOUS

PDF

35.2 KB Created: 2020-04-19 12:30:24 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d713bac799cb3293600618a8b89723ef SHA-1: aec0eaec1dfa623c855a8c34450deea361b54dd0 SHA-256: 0b48963cb227d487493ad238e1442eb5b522a1dbac38518937004989d88c7928
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which appear to be part of a link farm designed to artificially boost search engine rankings or redirect users to malicious content. The ML classifier strongly indicates maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to trick users into navigating to potentially harmful sites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://nocturnalparanormal.com/uploads/1/3/0/4/130483773/130483773.html#adobe+reader+apk+app
    • http://commerical-analytics.com/uploads/1/3/0/2/130288775/6373748.pdf
    • http://johnfordistrict9.com/uploads/1/3/1/3/131379655/modivizajipakixedina.pdf
    • http://dalahalsan.com/uploads/1/3/1/4/131482916/guxowuperudut.pdf
    • http://ottoorganics.com/uploads/1/3/0/6/130604447/zalafevi.pdf
    • http://bmedical-marijuana.com/uploads/1/3/1/3/131398066/rewetuxajenewetu.pdf
    • http://tuesdayfoodie.com/uploads/1/3/0/2/130274098/fowomim.pdf
    • http://baubles-n-bling4u.com/uploads/1/3/0/7/130739046/furipivepum.pdf
    • http://salesraider.com/uploads/1/3/1/3/131384373/6a0eea9.pdf
    • http://riverstonegallerycustomgifts.com/uploads/1/3/1/6/131637364/3857001.pdf
    • https://www.html
    • 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_off000061c8.bin
dbe1b647425930e254358fb56e407ea82b913d1d1b68955a4c6ae4a9fe1489bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x61C8 8128 bytes

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