Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1a2591e20044cf8…

MALICIOUS

PDF

36.4 KB Created: 2020-06-12 02:42:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4d14f1e07b15dfa74d422626e6d0b2e SHA-1: 9572c8f58268877c434243b7a3b9c599684c201e SHA-256: b1a2591e20044cf8c6b45174db1313e6e06832bfca59d7bc40182153d4696dc1
94 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 point to domains structured for SEO spam. The ML classifier strongly indicated maliciousness. The document body, though heavily obfuscated, contains references to 'w3school xml tutorial' and metadata indicating it was generated by wkhtmltopdf, suggesting a lure to potentially malicious or spam-related content hosted on these numerous domains.

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://3577productions.com/uploads/1/3/1/3/131382382/131382382.html#w3school+xml+tutorial
    • http://suzifarms.com/uploads/1/3/0/5/130588951/06ef8d9cf1c48b9.pdf
    • http://northcoastmedicalplaza.com/uploads/1/3/0/5/130544131/63464.pdf
    • http://arizonafitnessspecialists.com/uploads/1/3/0/7/130775527/5541351.pdf
    • http://sharonmclendon.com/uploads/1/3/1/8/131857315/dalino_vusunolemanefi.pdf
    • http://therealrls.com/uploads/1/3/0/9/130969907/dumem.pdf
    • http://testafi.com/uploads/1/3/1/4/131407247/3642589.pdf
    • http://mx.holyfamily1699.org/uploads/1/3/0/5/130541211/98ff61.pdf
    • http://amythorneallisonslp.com/uploads/1/3/0/2/130289186/8f7a7fe042.pdf
    • http://jwballiance.com/uploads/1/3/0/3/130323596/pakazew.pdf
    • http://freelancehealing.org/uploads/1/3/0/5/130550800/00cb8a0e.pdf
    • http://happybuddhastudio.com/uploads/1/3/0/6/130620892/1178186.pdf
    • http://activelnternational.com/uploads/1/3/0/5/130539990/zixetabesuwikex-jizurif-jarigimivog-tudujofo.pdf
    • http://teachingachildtoread.com/uploads/1/3/1/0/131070314/a6ec2a1bf76.pdf
    • http://hashcab.net/uploads/1/3/1/6/131637362/7969047.pdf
    • https://zuvarore.files.wordpress.com/2020/06/lowizevebowepasamifu.pdf
    • https://dataxaju.files.wordpress.com/2020/06/15525912453.pdf
    • https://xezifemubet.files.wordpress.com/2020/06/47051417019.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_off00005f1c.bin
d64822cd76de21847fcf2172d9c111b131c23701799825e832335c3bb582f58b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5F1C 12140 bytes

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