Malicious PDF — malware analysis report

Static analysis result for SHA-256 292bcaeb28788d04…

MALICIOUS

PDF

84.0 KB Created: 2020-05-12 14:06:15 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 17146265ecd6412d76205b3d087f3d0b SHA-1: 013a388ce8f843cff00b1c7f780a0b61e32f6638 SHA-256: 292bcaeb28788d04241df231713c1fe8c8bc168aec3a8922548cacf2db70cbbe
94 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many of which point to seemingly unrelated content, indicative of a link farm. One prominent link, 'http://eldoradopasadena.com/uploads/1/3/0/5/130545885/130545885.html#malaria+combat+in+italy+ielts+reading+answers', is presented as a lure. The ML classifier also flagged this PDF as malicious. No scripts were extracted, but the extensive link farm suggests an attempt to distribute malicious content or redirect users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8508

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://eldoradopasadena.com/uploads/1/3/0/5/130545885/130545885.html#malaria+combat+in+italy+ielts+reading+answers
    • http://speechessentials.com/uploads/1/3/0/2/130271078/eb647ba63.pdf
    • http://cafezesta.com/uploads/1/3/1/4/131437362/5624874.pdf
    • http://hiawatha-motel.com/uploads/1/3/0/7/130776673/duzaj.pdf
    • http://salabova.com/uploads/1/3/0/8/130874623/7006907.pdf
    • http://familyhartlen.ca/uploads/1/3/0/9/130969841/nobodorafesa_raxakep_zijoravakede.pdf
    • http://reallysimplerealestate.org/uploads/1/3/0/9/130970023/vubejesuxel_jipagawaxa_tomofaxubigonab_gexemikurozub.pdf
    • http://invisiblekidsdocumentary.com/uploads/1/3/0/6/130639069/benusimane_zakivekorigib.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_off00006c73.bin
af7ba616e767be5daeb2fe2740bde8360f4802ea4812e13306bb8ebb43ffef79		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6C73 58592 bytes
font_01_sfnt_off00011d71.bin
a8f96f021c3f8ebfae482d8a2a03f6fad31df13eeeb471997b23b38c683126cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D71 10972 bytes

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