Malicious PDF — malware analysis report

Static analysis result for SHA-256 5ee1b8f0d5a2f728…

MALICIOUS

PDF

43.1 KB Created: 2020-04-15 01:42:05 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 98d13b03ef1ad1d5071479be0a956540 SHA-1: 5b9e3a24a2e3c715c08dfe1435ca3bd7ac640e8e SHA-256: 5ee1b8f0d5a2f72853dd7e618fb3a5f2b92f005d7d4b646cf893752045e036f7
104 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to direct users to malicious content. The ML classifier strongly indicated maliciousness, and the presence of a 'download button' heuristic further supports a lure-based attack. The file's purpose appears to be to facilitate the download of further malicious payloads via these numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://rutgerscybersecurity.com/uploads/1/3/0/6/130604632/130604632.html#almaany+dictionary+free++for+pc
    • http://caricaturesbysimon.com/uploads/1/3/1/6/131636917/1d261.pdf
    • http://therootsofsonnenblume.com/uploads/1/3/0/9/130969334/cedad7831aad79a.pdf
    • http://clearyourclutterconsulting.com/uploads/1/3/0/6/130621109/gepidudifup.pdf
    • http://juventus.site/uploads/1/3/0/6/130621803/desorabegixib-basituw.pdf
    • http://reellife-music.com/uploads/1/3/0/4/130483649/748101.pdf
    • http://fitnessforsavages.com/uploads/1/3/1/4/131437858/f8bf7b.pdf
    • http://mdaccountants.net/uploads/1/3/1/4/131407877/325add39.pdf
    • http://saltwateraloha.com/uploads/1/3/1/4/131405962/guleto.pdf
    • http://streetwiseconsultinggroup.com/uploads/1/3/0/3/130313541/cb0db32b3d26402.pdf
    • http://iwa-tellmyanmar.com/uploads/1/3/0/5/130539886/8e47f994c8acd.pdf
    • http://sorrentospringsequity.com/uploads/1/3/0/7/130738666/9657426.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_off000081a5.bin
d7721a3599147d49da96c1ecf2163441e69f865619672cf89846bc2c439554b9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x81A5 8104 bytes

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