Malicious PDF — malware analysis report

Static analysis result for SHA-256 75252aff8a0baf0f…

MALICIOUS

PDF

37.3 KB Created: 2020-03-30 17:46:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8634b5b18d64988fc69d9548ec051a6a SHA-1: 6bd301d30b009d6915d6f9319d7eac5b9dd4cde1 SHA-256: 75252aff8a0baf0f1a4573bda11c3f340d6ebe8589cf94d86c4992bdf7e01698
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL points to an HTML file, while many others point to PDF files, suggesting a link farm or content distribution network. The ML classifier also strongly indicated maliciousness. No scripts were extracted, and the document body was heavily obfuscated, making it difficult to determine the exact user-facing lure.

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://popjetfountain.com/uploads/1/3/1/3/131381589/131381589.html#a+doll%27s+house+act+1+questions
    • http://juliadell.com/uploads/1/3/1/3/131381680/2e5bd8b4138162.pdf
    • http://nutricline.com/uploads/1/3/0/7/130775627/nemamu.pdf
    • http://oceannotions.com/uploads/1/3/1/4/131454237/9718e97b30.pdf
    • http://michaelroll.net/uploads/1/3/1/4/131437362/11f548a20d4.pdf
    • http://evelazquezbonilla.com/uploads/1/3/0/3/130323567/6092649.pdf
    • http://tdinnovationsllc.com/uploads/1/3/0/8/130874067/nesorane-bokivikupev.pdf
    • http://www.tbc.mmac.org/uploads/1/3/1/4/131407377/rerulixusa-poredi-fazidun.pdf
    • http://noblevirtues.org/uploads/1/3/0/5/130588195/16c5b4e7e4.pdf
    • http://www.allieplatt.com/uploads/1/3/0/3/130313539/561460.pdf
    • http://g2h2stpete.com/uploads/1/3/0/5/130543878/jirezilozi_tevimitoli_dijerefil.pdf
    • http://sandyinsanity.com/uploads/1/3/0/6/130604795/xivom_dizawimodero_texinevenefatev.pdf
    • http://shopalienaura.com/uploads/1/3/0/8/130874352/478856.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_off000069bd.bin
47f7376e45f0189f6b1f6ea3cf1672192ed33de81da4d800cb2050331de2b37a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x69BD 7404 bytes

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