Malicious PDF — malware analysis report

Static analysis result for SHA-256 88e09ba6a3bced17…

MALICIOUS

PDF

42.9 KB Created: 2020-03-19 02:09:06 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1b880634f49489e03fd20198d0b8cb6a SHA-1: 9b0037ef2b95337874f307149eaa1b163a2bf732 SHA-256: 88e09ba6a3bced1762657f181da498740ef1a8dd663f92bde5013495c61a8139
94 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, pointing to various PDF documents on different domains. The ML classifier also flagged this PDF as malicious with high confidence. The document body contains garbled text and some of the extracted URLs, suggesting a link farm or SEO manipulation tactic, potentially used to distribute further malicious content or engage in click fraud.

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://bejustalittlebetter.com/uploads/1/3/0/7/130738528/130738528.html#velocidad+de+flujo+volumetrico
    • http://debaryhomesales.com/uploads/1/3/0/2/130271016/e982fc6ac.pdf
    • http://empowermentcoachforwomen.com/uploads/1/3/0/2/130289214/rebozawudib_rugibinobetew.pdf
    • http://yeswheatridge.org/uploads/1/3/0/9/130969840/3489463.pdf
    • http://epromomarketing.info/uploads/1/3/0/9/130969702/7800223.pdf
    • http://eardoc.co.za/uploads/1/3/0/7/130739577/busapejurogexatare.pdf
    • http://mail.sticksandstonescounselling.co.uk/uploads/1/3/0/8/130874504/vitowenirumup.pdf
    • http://crowdlistings.com/uploads/1/3/0/6/130621292/widibusitikimav.pdf
    • http://newencores.com/uploads/1/3/0/3/130313391/132eee885.pdf
    • http://philliprodriguez.net/uploads/1/3/0/3/130313299/kabaxo-fixobuzezafu-tovet-wolekawuwuwu.pdf
    • http://hostmaster.elgusto-rehau.de/uploads/1/3/0/4/130483809/nidexal.pdf
    • http://rascomgreenbuildservices.com/uploads/1/3/0/2/130272638/5681583.pdf
    • http://gardenstatedeli.com/uploads/1/3/1/1/131164428/9416004.pdf
    • http://plantseverywhere.com/uploads/1/3/0/6/130620898/lalogujuxubi.pdf
    • http://lesliehaddow.com/uploads/1/3/0/4/130488969/manebabuwi_sekeri_vorafefi_vamat.pdf
    • http://wilkes-barrecity.com/uploads/1/3/0/3/130379226/7778684.pdf
    • http://racqueteerproshop.com/uploads/1/3/0/6/130639779/6415944.pdf
    • http://becketbender.com/uploads/1/3/0/6/130621388/durebidomezobufuta.pdf
    • http://mail.sproutsmyanmar.com/uploads/1/3/0/4/130483397/vezupefuwozu.pdf
    • http://nadinelambert.com/uploads/1/3/0/7/130775294/ad90aa0.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_off00007088.bin
27502fb128660014d97a3197347c80ffd8836e8ab8455e4828e7f7d1e8e74fc3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7088 8792 bytes
font_01_sfnt_off000090e8.bin
7301ea46e75410899d88b093e0b7f737a8254be2a3b8a54b9dc73d7ea30f8704		 pdf-font-stream PDF embedded font (sfnt) at offset 0x90E8 3172 bytes

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