Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51c9f560c5b3c0a…

MALICIOUS

PDF

40.2 KB Created: 2020-04-11 09:08:46 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1dd72629f4ac14e2c3268fb96ee652cd SHA-1: 2c2a273bc114047e403d45f64326ceeb2606492a SHA-256: f51c9f560c5b3c0a36910a81f4707924e144b91e7abca147d5b2fe3a01557cd5
94 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link T1059.001 PowerShell

The PDF contains a large number of external links, many of which point to domains that appear to be part of a link farm designed to host malicious content. The ML classifier strongly indicated maliciousness. The document body, though partially corrupted, contains text related to 'demonstrative pronouns worksheets with answers' and references the authoring application, suggesting a lure to disguise the malicious intent of directing users to external, potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://74-123-72-236.mgwnet.com/uploads/1/3/1/3/131398110/131398110.html#demonstrative+pronouns+worksheets+with+answers
    • http://jaguaroutfitters.shop/uploads/1/3/0/4/130435561/kotelopolok.pdf
    • http://senlandream.com/uploads/1/3/1/4/131406762/464ec1337c.pdf
    • http://microbladingportland.com/uploads/1/3/1/4/131453902/5f7d43b3955.pdf
    • http://poetrypush.com/uploads/1/3/1/4/131454556/9423869.pdf
    • http://vivopsych.com/uploads/1/3/0/7/130740427/72764a61b3912c.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_off00006968.bin
d7be42da3865fc83180554fe66e085ab514d209e6dd4b11eab86ba61affd4bc8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6968 8424 bytes
font_01_sfnt_off000089e0.bin
734f66c00855ad757bb940939432f0625c955ebca24cea413703e2d7d546a083		 pdf-font-stream PDF embedded font (sfnt) at offset 0x89E0 2980 bytes

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