Malicious PDF — malware analysis report

Static analysis result for SHA-256 65c2be3ebb9db7ca…

MALICIOUS

PDF

47.5 KB Created: 2020-04-04 07:18:03 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e6d314081181e3f1b320be982241ba1f SHA-1: 5c0c1d4536644c28d7dbbbdfce12cde75f5f9fe9 SHA-256: 65c2be3ebb9db7ca829e8d046268e0dfdd8a95f25c7d181c0a7c0284f29dd71f
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links to other PDF files hosted on various domains, identified as a PDF link farm. The ML classifier strongly indicated maliciousness, and the embedded URLs suggest a campaign to manipulate search engine results or distribute further content. No scripts were extracted, but the structure and URL patterns are indicative of a malicious SEO or content distribution scheme.

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://pestcontrolrockwall.com/uploads/1/3/0/6/130604416/130604416.html#a+new+lease+of+death+ruth+rendell+pdf
    • http://xenon68.com/uploads/1/3/0/4/130490643/1306407.pdf
    • http://laughingfinchfarm.com/uploads/1/3/0/6/130604473/2946931.pdf
    • http://gicarepro.com/uploads/1/3/0/7/130739816/pebeseledik-tesumuvedek.pdf
    • http://dewumine.com/uploads/1/3/1/3/131383708/6413c49034c6.pdf
    • http://skinnyfibereasy.com/uploads/1/3/0/7/130739247/9440617.pdf
    • http://everythinglaurajo.com/uploads/1/3/0/8/130813648/52023a56.pdf
    • http://federicoealessia.com/uploads/1/3/1/4/131455024/mutitigibagaz-tazojudometu.pdf
    • http://atlasdrivingschools.com/uploads/1/3/1/3/131379544/4900715.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_off00009002.bin
f04287ac0b89e6aeb053b6a2c69beb09c4ddeac845eeae72764d2199bf54341a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9002 8932 bytes

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