Malicious PDF — malware analysis report

Static analysis result for SHA-256 025ad0a71008c215…

MALICIOUS

PDF

29.5 KB Created: 2020-04-25 17:45:53 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 62c099681666ae64eb8c31e5d4f96a5d SHA-1: 25dd2b6a3273548c09b289644d91179fd8a70224 SHA-256: 025ad0a71008c2152d61b22a46b910b4088df19c8193b52fd7e30a7d0b3d6fce
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. These links point to various domains, suggesting a link farm or distribution network. No scripts were extracted, and the document body is heavily obfuscated, making it difficult to determine the exact user-facing lure. The ML classifier strongly indicated maliciousness.

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://usa-autoss.com/uploads/1/3/1/3/131398195/131398195.html#dateline+reporters+2018
    • http://cafetwocann.com/uploads/1/3/0/6/130604428/womizaxuxepezuno.pdf
    • http://mygrtbigftgreekstore.com/uploads/1/3/0/2/130270790/zikanisu.pdf
    • http://kindacreativedesigns.com/uploads/1/3/0/7/130775214/6550112.pdf
    • http://ampoutdoors.com/uploads/1/3/1/4/131405976/6272660.pdf
    • http://whywaittochange.com/uploads/1/3/0/7/130775503/riruxiji-rivojazas-pijuful-dagewubepi.pdf
    • http://meganoloughlincreative.com/uploads/1/3/0/5/130544541/lasofi_xamozegabojixib_lemebajikutibis_kipuziruwuki.pdf
    • http://transitionalpropertyinvestments.com/uploads/1/3/0/5/130550778/7798565.pdf
    • http://386washington.com/uploads/1/3/0/5/130588568/xolelozowo_dazitorafera_jokopojaz_vuvorerut.pdf
    • http://danielle-shelton.com/uploads/1/3/0/5/130540046/5cd5c389365.pdf
    • http://endoflifedoula.co/uploads/1/3/0/9/130969535/fusivim.pdf
    • http://drdavidpeaco.com/uploads/1/3/1/6/131606314/5531066.pdf
    • http://wordsmithedwards.com/uploads/1/3/0/5/130550998/pasazezam.pdf
    • http://jlspecializeddesigns.com/uploads/1/3/1/0/131070148/1967845.pdf
    • http://fredweld2.com/uploads/1/3/0/7/130775674/nusabodefam.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_off00005021.bin
709aa45d24ff99988959ca79a5e997cdc813cbd5276dad7c7d96a61f5fad8401		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5021 6416 bytes

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