Malicious PDF — malware analysis report

Static analysis result for SHA-256 36ba443d4279b98a…

MALICIOUS

PDF

39.0 KB Created: 2020-04-07 12:17:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: fc544c19fad14388e7328235575d7820 SHA-1: b5817e420d9c60ac118f579f97ebadcf0909f21f SHA-256: 36ba443d4279b98a7fc3c420fc916ff10817786503ae4a43375f9915806ddfba
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to domains that appear to be part of a link farm. The document body, though heavily obfuscated, contains text related to sheet music, suggesting a lure. The ML classifier strongly indicated maliciousness. The primary attack pattern involves redirecting users to external URLs, likely for phishing or malware distribution.

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://therealmollyanderson.com/uploads/1/3/1/4/131437625/131437625.html#ballade+pour+adeline+richard+clayderman+piano+sheet+music
    • http://achoice4avoice.com/uploads/1/3/1/4/131438245/7ae8304a76210.pdf
    • http://akleis.com/uploads/1/3/0/7/130740033/4445783.pdf
    • http://houstonfromtheair.com/uploads/1/3/0/5/130540567/cd6eef0b1254.pdf
    • http://disneyworldrentalharrypotter.com/uploads/1/3/1/1/131164164/zeluzolu-faxibadubig.pdf
    • http://mkebookscoach.com/uploads/1/3/1/4/131437850/56b62f0f9.pdf
    • http://metconengineering.com/uploads/1/3/1/3/131398292/8862719.pdf
    • http://sacredsummitchocolate.com/uploads/1/3/0/4/130483794/menovamevatugom.pdf
    • http://houstonfromtheair.com/uploads/1/3/0/5/130540567/cd6eef0
    • 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_off00006d26.bin
e024e1f3b19e54ac6e5b4cf33c15f40b9e61d294d3803ddfe16d4be5e6204611		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D26 9184 bytes

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