Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b5073e77a976d89…

MALICIOUS

PDF

34.2 KB Created: 2020-04-29 06:12:20 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: c8d7ddd0a5a379d2f56cac990a1e2ece SHA-1: b7a069062eaac5a7f65b1e9154ec653d06eea617 SHA-256: 0b5073e77a976d8964dcdc787cfec2ca25bc21269c01e1c78c23fe9c7ce9f161
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to other PDF documents with numeric slugs. This suggests a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and the heuristic firings indicate malicious intent to redirect users to potentially harmful content. The ML classifier strongly supports the malicious verdict.

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://grandlenstudios.com/uploads/1/3/0/6/130639448/130639448.html#jll+market+research+reports
    • http://bizwithbek.com/uploads/1/3/0/6/130639574/suvusiferadelip-givef-suxipufasuzux.pdf
    • http://rockyourmindset.net/uploads/1/3/0/8/130814534/4908495.pdf
    • http://educate-2-empower.org/uploads/1/3/0/3/130323091/1573505.pdf
    • http://teethwhiteningsanfrancisco.com/uploads/1/3/0/7/130775192/8827364.pdf
    • http://emmadunne.com/uploads/1/3/1/3/131398045/3327986.pdf
    • http://sunshineandwildthings.com/uploads/1/3/0/6/130621646/ab1b109e997be.pdf
    • http://trailertwistlocks.com/uploads/1/3/0/3/130313422/wuwidixubaxa.pdf
    • http://te-ama.com/uploads/1/3/1/4/131438127/bb064d.pdf
    • http://snowgripit.com/uploads/1/3/0/4/130477490/5bfbb11c87d.pdf
    • http://boomerangdallas.com/uploads/1/3/0/8/130814066/8987789.pdf
    • http://triadmarketplacenc.com/uploads/1/3/1/3/131379401/lafefemebow_bodesevebisege_xoxesotoli_nexon.pdf
    • http://prophyaid.com/uploads/1/3/0/8/130814993/jegibot.pdf
    • http://thechristmind.net/uploads/1/3/0/7/130776423/pimafiwugewakoduraz.pdf
    • http://natashanatraj.com/uploads/1/3/0/8/130874497/rozugegisaxija.pdf
    • http://nbrgraphs.com/uploads/1/3/0/9/130969804/1150212.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_off00005d7b.bin
51dfc14a60e0dcbd96825b748bf9563e867668126501be57af6ec0771d3ef6bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D7B 8500 bytes

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