Malicious PDF — malware analysis report

Static analysis result for SHA-256 80f22eca3108073b…

MALICIOUS

PDF

36.8 KB Created: 2020-06-02 21:29:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 76c1cd1486df69745c9b8c5a873ead39 SHA-1: 18526187d7d61677412b6625603b9327a9ec3cf0 SHA-256: 80f22eca3108073b7f36b4d12dcd282d34578527037c00234fed663425d1ef1a
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which are structured as a link farm. The document body, though partially corrupted, includes a URL that appears to be a lure for 'Altra galaxy tv stand instructions'. The presence of numerous unknown reputation URLs suggests an attempt to redirect the user to malicious content or download further stages. The ML classifier strongly indicated maliciousness.

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://74-123-79-59.mgwnet.com/uploads/1/3/0/5/130546000/130546000.html#altra+galaxy+tv+stand+instructions
    • http://dbcateringevent.com/uploads/1/3/0/4/130483213/wafaxonodezukewaseso.pdf
    • http://tarachristensen.com/uploads/1/3/0/6/130605283/xivefagiwawefoj.pdf
    • http://nwlaxshack.com/uploads/1/3/0/6/130639334/posusetolavizezazuf.pdf
    • http://fvgma.com/uploads/1/3/0/6/130605104/vusetagub_wagepoluf_dowaxagitozo.pdf
    • http://oakalleydesigns.com/uploads/1/3/0/6/130603969/2108123.pdf
    • http://arenewedmind.us/uploads/1/3/0/7/130775840/5301594.pdf
    • http://pitterpatterdogcare.com/uploads/1/3/1/3/131380814/nuzikex.pdf
    • http://74-123-79-59.mgwnet.com/uploads/1/3/0/5/130546000/terms.html
    • http://74-123-79-59.mgwnet.com/uploads/1/3/0/5/130546000/dmca.html
    • http://74-123-79-59.mgwnet.com/uploads/1/3/0/5/130546000/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://wofopisuf.files.wordpress.com/2020/05/96189793082.pdf
    • https://jipebowojor.files.wordpress.com/2020/05/tazanurukaromu.pdf
    • https://juxisaw.files.wordpress.com/2020/05/37509707037.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006571.bin
0b33131dc3b59356600940600d6661ed16d7612d1a99bb5094156ca2bbffb861		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6571 10100 bytes

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