Malicious PDF — malware analysis report

Static analysis result for SHA-256 990d56b56c77d10a…

MALICIOUS

PDF

40.5 KB Created: 2020-03-29 05:50:18 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f7b7fb477eb73ad177fcb3c93c896e6e SHA-1: 078e48beaf9f70caac1e9b05e8e13280011aa15c SHA-256: 990d56b56c77d10a2ac8668c090175b1ccae0e427c102ff72f4b3eb8b3e6eb84
94 Risk Score

Malware Insights

MITRE ATT&CK
T1059.001 PowerShell T1204.002 Malicious Link

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, though partially corrupted, contains references to the URLs, suggesting a deliberate attempt to link to a network of pages. This pattern is often used for SEO spam or to distribute further malicious content.

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://michaudwellness.com/uploads/1/3/0/6/130620951/130620951.html#frases+de+pensadores+sobre+educacao+infantil
    • http://olandesina.net/uploads/1/3/0/5/130540159/c4eaa.pdf
    • http://ktaccountingservicesllc.com/uploads/1/3/0/3/130323249/b2961038a52.pdf
    • http://www.shoptws.org/uploads/1/3/0/4/130476514/xirofisajerebef.pdf
    • http://broadwateradvertising.com/uploads/1/3/0/6/130639616/juvipunanuxa-tipeg-vitugi.pdf
    • http://pocdogs.org/uploads/1/3/0/2/130270869/jefitazimekemupigu.pdf
    • http://mijooski.com/uploads/1/3/0/7/130739346/nevuvuxewozisib.pdf
    • http://caseysbachelorette.com/uploads/1/3/0/5/130588270/vubuvi-dejegilisij.pdf
    • http://paris-pledge.org/uploads/1/3/0/2/130289433/damuzixoge.pdf
    • http://hostmaster.bloomcreations.ch/uploads/1/3/0/6/130604530/xufuvoranutovi.pdf
    • http://peacebypiece-customlettering.com/uploads/1/3/0/8/130815097/filabes.pdf
    • http://cprsd2.com/uploads/1/3/0/6/130621646/8853489.pdf
    • http://prismautodetail.com/uploads/1/3/1/4/131437983/sabajufarupa.pdf
    • http://katherinemarpe.com/uploads/1/3/0/5/130539427/9955330.pdf
    • http://mail.briketes.eu/uploads/1/3/0/5/130588546/6654341.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_off000071af.bin
f8310c9c8f79427a98035ab7a8278d76879a73811d2ac5085d305a01fafe775b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x71AF 10008 bytes

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