Malicious PDF — malware analysis report

Static analysis result for SHA-256 144236656a5d7e74…

MALICIOUS

PDF

54.4 KB Created: 2020-03-22 03:10:04 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: f47f8eca21049a3cc7250b054fea0b96 SHA-1: 98548342e1afb3bb948b90a803e8d8caac023b77 SHA-256: 144236656a5d7e7478f2c5e744d1d107aeb450e48ff5a954647ad50fe2c3a184
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic identified a mass of external PDF links. While no scripts were extracted, the embedded URLs are the primary indicators of malicious intent, likely serving as a gateway to 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://grizzlyrentalsonline.net/uploads/1/3/0/4/130488417/130488417.html#elementos+facticos+de+la+teoria+del+caso
    • http://cglivefully.com/uploads/1/3/0/5/130551986/745674.pdf
    • http://fabfotobooth.net/uploads/1/3/0/5/130543855/kukuxubomode.pdf
    • http://www.carboxy.net/uploads/1/3/0/5/130590719/65746a11d7.pdf
    • http://www.andreadownie.com/uploads/1/3/0/5/130545173/dusejivulemomipid.pdf
    • http://michellesfavoritethings.net/uploads/1/3/0/3/130379326/9260397.pdf
    • http://weberhomeinspection.com/uploads/1/3/0/5/130542822/4413553.pdf
    • http://psykhepress.com/uploads/1/3/0/3/130379060/36c9524.pdf
    • http://thetimeittakes.me/uploads/1/3/0/6/130603818/wojinomobufak.pdf
    • http://hostmaster.gemeinschaftsschule-gersheim.de/uploads/1/3/0/2/130288893/1278654.pdf
    • http://hcbw.org/uploads/1/3/0/5/130551202/monasu-diponimuwox.pdf
    • http://whisperingsheepholdings.com/uploads/1/3/0/5/130550749/ab4a98a5c2fd84.pdf
    • http://unicobodenbelaege.com/uploads/1/3/0/2/130289393/8821434.pdf
    • http://tradingblockadvisors.com/uploads/1/3/0/2/130289345/nunujataj_musajura.pdf
    • http://fusr-u.com/uploads/1/3/0/5/130540046/lokiketebuzigi.pdf
    • http://dominionintegration.com/uploads/1/3/0/9/130969835/jogodozexole.pdf
    • http://seryjunos.com/uploads/1/3/0/7/130776814/7d90b0.pdf
    • http://terratechwiki.com/uploads/1/3/0/4/130493816/cd8ff877d8.pdf
    • http://www.amydavisdigital.com/uploads/1/3/0/4/130489377/ketaremod.pdf
    • http://renediamond.org/uploads/1/3/0/3/130312926/710312e77074.pdf
    • http://jenniferberton.com/uploads/1/3/0/3/130379365/5956813.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_off0000a7ee.bin
a0d1fa1f92c68343449c6ce36cbb62197b3f546edbfb9feb1454443abf1ea0e5		 pdf-font-stream PDF embedded font (sfnt) at offset 0xA7EE 9520 bytes

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