Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bcbd805770bfdba…

MALICIOUS

PDF

43.6 KB Created: 2020-03-20 07:40:50 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e190f605c9d9c36bd437e9a39d7cc8db SHA-1: bdae64141fe686c30b3e836eb3fc49c931c53ffc SHA-256: 1bcbd805770bfdbaa6651e927e2795b923dad252f106f62a0d8f8be42cf665fb
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are numerically or generically named, suggesting a link farm or SEO spam tactic. The document body, though heavily obfuscated, contains references to 'hvac troubleshooting flowchart pdf' and multiple URLs pointing to similarly structured PDF files on various domains. This indicates the primary purpose is to drive traffic to these external sites, potentially for malicious advertising, phishing, or further malware distribution.

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://quantumpropertyandrealty.com/uploads/1/3/0/7/130739454/130739454.html#hvac+troubleshooting+flowchart+pdf
    • http://mynxbeautybar.ca/uploads/1/3/0/8/130814339/8515939.pdf
    • http://climatechangeunitedeire.com/uploads/1/3/0/5/130588390/ee2567b.pdf
    • http://humphreysfreelancemedia.com/uploads/1/3/0/5/130544826/8580bf19dd.pdf
    • http://www.psicolo.net/uploads/1/3/0/8/130874211/goxaverajosos_fabob.pdf
    • http://artofhostingns.ca/uploads/1/3/0/7/130740164/4961f85cb7.pdf
    • http://rivkysphotography.com/uploads/1/3/0/8/130874221/98ef03.pdf
    • http://www.spotcoweb.com/uploads/1/3/0/3/130323092/8227390.pdf
    • http://thesafavifoundation.org/uploads/1/3/0/7/130775130/f3e01ef16b.pdf
    • http://astoriafilmfest.com/uploads/1/3/0/5/130588686/dd166089.pdf
    • http://www.diazhardwareinstallers.com/uploads/1/3/0/6/130620826/4663727.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_off000083f8.bin
a90892277c3347da3f336262ef073537fb4d2142c030480802bd6d53e7191203		 pdf-font-stream PDF embedded font (sfnt) at offset 0x83F8 7684 bytes

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