Malicious PDF — malware analysis report

Static analysis result for SHA-256 2550b2c82444d072…

MALICIOUS

PDF

40.9 KB Created: 2020-05-17 00:22:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: db5ac805c1ae4d0bc7d0985cb3e8620f SHA-1: 6890fd17e264a122ad91488d9000f05c66dbc133 SHA-256: 2550b2c82444d072e961cffba69c6e32246085aff52ad06a7e0e4257b789940b
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various domains. The ML classifier also strongly indicated maliciousness. The document body contains a mix of seemingly unrelated text and URLs, suggesting a spam or SEO poisoning tactic. No scripts were extracted from this sample.

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://iweargreatness.com/uploads/1/3/0/2/130289431/130289431.html#gana+achu+new+hd+video+song
    • http://trianglebusinessnetworks.com/uploads/1/3/0/4/130435955/zopojutugegolag-tikeke-xegaboziz.pdf
    • http://massagebylisa.net/uploads/1/3/0/7/130739775/ce4e19e8ad2a463.pdf
    • http://lookingwithin.ca/uploads/1/3/1/4/131438692/b0acc7d25dbff8.pdf
    • http://bulldogrestorationservices.org/uploads/1/3/0/7/130776149/vududalumawog_tolavajafa_ronodibev.pdf
    • http://ileftmyangel.com/uploads/1/3/0/9/130969939/guxupugebejekavutixe.pdf
    • http://21centuryhs.com/uploads/1/3/0/7/130775427/6958500.pdf
    • http://aircheckmoncton.com/uploads/1/3/0/5/130543212/8268a98d666b.pdf
    • http://celestialharmonyproductions.com/uploads/1/3/1/3/131381614/ridisavojegazojoz.pdf
    • http://createcapitaladvisors.com/uploads/1/3/0/3/130379297/2117239.pdf
    • http://greatrecessframework.org/uploads/1/3/1/4/131438610/likunimikij.pdf
    • http://parktowncommunion.net/uploads/1/3/0/5/130589442/foluvimomozaduxo.pdf
    • http://polycarbonatewholesale.com/uploads/1/3/0/6/130604492/8230679.pdf
    • http://oasistankservices.com/uploads/1/3/0/5/130589202/151898.pdf
    • http://theroguerobots.com/uploads/1/3/0/5/130551187/julobexo.pdf
    • http://espanola-vbbc.org/uploads/1/3/0/5/130540293/124758b42d2f.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000059e6.bin
cbcc920ab5d2b44bcc1e224549894d5e107ba9402fed944d7431f014b510e208		 pdf-font-stream PDF embedded font (sfnt) at offset 0x59E6 9512 bytes
font_01_sfnt_off00007372.bin
db68a57132c8148cf528a89566c71060ca8363ba66987885241212b04a17798c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7372 10692 bytes

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