Malicious PDF — malware analysis report

Static analysis result for SHA-256 f471d7e8d9d2f91b…

MALICIOUS

PDF

47.4 KB Created: 2020-05-13 23:59:10 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0941d01ce767ab0e49976b0357fe0f01 SHA-1: e18dfac8da719cd36eaafebed73722982edd9a98 SHA-256: f471d7e8d9d2f91bfce5ff9555cae3cf973b512a35447a8e981361f54cea0c60
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially obfuscated, contains the text 'Hardest bible questions and answers' and several URLs, reinforcing the link farm detection. The ML classifier also strongly indicated maliciousness. The primary attack pattern appears to be directing users to a network of potentially malicious or SEO-manipulated websites.

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://avabaycompany.com/uploads/1/3/0/5/130550824/130550824.html#hardest+bible+questions+and+answers
    • http://hunterstridephotography.com/uploads/1/3/0/3/130379141/42764.pdf
    • http://psychicmolly.com/uploads/1/3/0/9/130969473/8110853.pdf
    • http://beststarcakes.com/uploads/1/3/1/0/131070035/0baddc21a61c.pdf
    • http://globalprayerministries.com/uploads/1/3/1/4/131406049/4814533.pdf
    • http://corneliushofman.com/uploads/1/3/0/3/130323491/f57739a37.pdf
    • http://k8erdmann.com/uploads/1/3/0/5/130541271/4190950.pdf
    • http://modpropmgmt.com/uploads/1/3/0/4/130436014/laxekifajosopipeva.pdf
    • http://starautollc.com/uploads/1/3/1/6/131606255/8cd9ffd4ab39.pdf
    • http://brighthings.com/uploads/1/3/0/3/130323290/gubawulumoxuxox_bekaviluwigufi_rusasipejuzol.pdf
    • http://electstevegottlieb.com/uploads/1/3/0/6/130621258/kaxososogesixapoka.pdf
    • http://livewhileyouaredying.com/uploads/1/3/1/6/131636743/zironedeje-pejodibenitav-wusedivomabori.pdf
    • http://greyriderfordixiecom.com/uploads/1/3/0/2/130287976/tipoj-sisewo.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_off00008dcc.bin
d09412a8aac936e8f9123362d243a1b802fd4526fe1e10b6304aa0243bd17e10		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8DCC 10704 bytes

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