Malicious PDF — malware analysis report

Static analysis result for SHA-256 3edebe346e5e51bb…

MALICIOUS

PDF

38.0 KB Created: 2020-04-08 11:18:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: eb05907464e82c18351341179cbf0945 SHA-1: 993d56c20fce823b72cf803013a67a0a66997c4d SHA-256: 3edebe346e5e51bb32a4f4a5eb6c0c1bed4b18e0fb305f299cbb0c5698ca61a5
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are SEO-optimized and point to domains that appear to be part of a link farm. The primary purpose seems to be to direct users to these external sites, potentially for SEO spam, phishing, or to host further malicious content. The ML classifier strongly supports the malicious nature of this PDF.

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://trojancoffeecompany.com/uploads/1/3/0/5/130550722/130550722.html#a+suitable+boy+by+vikram+seth+amazon
    • http://hackjazzer.com/uploads/1/3/0/7/130739269/9523616.pdf
    • http://rockymountianmetis.com/uploads/1/3/0/7/130775932/rabavirenokifubuj.pdf
    • http://caraveladanbury.com/uploads/1/3/0/5/130589077/491d264c09e0c41.pdf
    • http://mysunshineonline.com/uploads/1/3/0/4/130483191/givurubixigiwe-patikekedaf-lutosokuded-kafaso.pdf
    • http://homerunpress.nyc/uploads/1/3/1/3/131384227/193350998a6.pdf
    • http://concordtraveltaxservices.com/uploads/1/3/0/3/130379527/budexavokele.pdf
    • http://theburritoshopyork.com/uploads/1/3/1/0/131070458/sexifidaw-zizotu-kuvexanudeja.pdf
    • http://makaistrategem.com/uploads/1/3/0/6/130640109/lotetedopodopakuv.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_off000069f6.bin
d364f244d3e41a20f96c6808ed8d20dca993c9b6511d4c9827fdb452bb7c8392		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69F6 8148 bytes

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