Malicious PDF — malware analysis report

Static analysis result for SHA-256 9e8ba945d081169e…

MALICIOUS

PDF

36.0 KB Created: 2020-03-07 18:47:19 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c518021471733fb20645911a22ab51d6 SHA-1: 6cf0516d2d51427e3ead9d1bea6aae06a13acf87 SHA-256: 9e8ba945d081169ea3b60ddcfb98377d3079512a1de2dac7e31115d586a4415d
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness. While no scripts were extracted, the PDF structure and numerous external links suggest a delivery mechanism for further compromise. The primary attack pattern involves directing users to a link farm.

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://www.petroclasses.com/uploads/1/3/0/4/130476039/130476039.html#bosu+ball+balance+exercises+core
    • http://feralavout.com/uploads/1/3/0/2/130272905/nedopikativeb.pdf
    • http://imminentquest.com/uploads/1/3/0/3/130323748/6629797.pdf
    • http://whoonwswater.org/uploads/1/3/0/6/130620783/bawapobijako_zelogoda.pdf
    • http://ajwarner.com/uploads/1/3/0/2/130271103/a2e3fdd9c3e6d.pdf
    • http://jdbevents.org/uploads/1/3/0/5/130547024/5293179.pdf
    • http://livinglifeonhigh.net/uploads/1/3/0/6/130621995/rafatikapatepomagami.pdf
    • http://antelopevistacarehome.com/uploads/1/3/0/4/130488227/c7258d.pdf
    • http://1275ministerial.com/uploads/1/3/0/5/130589431/tezozijokobarub.pdf
    • http://robyntapley.com/uploads/1/3/0/4/130476410/2bb90e.pdf
    • http://mta-sts.mail.earlytreatment.org/uploads/1/3/0/6/130639855/2dfc2a91a.pdf
    • http://thuvaiyal.com/uploads/1/3/0/6/130621542/mafepupez.pdf
    • http://www.fire-destroys-veterans-house.com/uploads/1/3/0/5/130551065/nenujelu_xivex_babeziza.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_off0000664b.bin
2307488be1a9c2846f4a97db0e4f0a88af6c53c51e1f21c9b9ea90511d93113b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x664B 7316 bytes

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