Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f6a6aa99357e764…

MALICIOUS

PDF

47.5 KB Created: 2020-06-03 19:42:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c76025a7c14931ce1a1d2c0fbb85e6fb SHA-1: f05266f01b799c873b956c607d5ba6de42015444 SHA-256: 4f6a6aa99357e764fb890097977dcb8a852c76d3289cd235d0e5c95b3941bc71
94 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier as malicious. It contains a large number of external links, many pointing to domains that appear to be part of a link farm. The document body contains corrupted text but includes a URL that is also present in the heuristics, suggesting the primary function is to redirect users to malicious or SEO-abused websites.

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://74-123-78-154.mgwnet.com/uploads/1/3/1/8/131872054/131872054.html#cinco+etapas+de+la+alfabetizaci%25C3%25B3n+su
    • http://eileenjennings.com/uploads/1/3/0/5/130540116/eba756a3e8771df.pdf
    • http://wirelessoptionsoh.com/uploads/1/3/0/8/130813416/xovebifi.pdf
    • http://skyhighvisuals.co.uk/uploads/1/3/0/8/130813409/sasivixofojosu-monupudel-gowura.pdf
    • http://hostmaster.roxelpta.org/uploads/1/3/0/8/130815013/pinopiwit_divobovi_sikegalilito.pdf
    • http://74-123-78-154.mgwnet.com/uploads/1/3/1/8/131872054/terms.html
    • http://74-123-78-154.mgwnet.com/uploads/1/3/1/8/131872054/dmca.html
    • http://74-123-78-154.mgwnet.com/uploads/1/3/1/8/131872054/policy.html
    • https://kuzelelete.files.wordpress
    • https://babupaxe.files.wordpress.com/2020/05/42750250993.pdf
    • https://kuvowiv.files.wordpress.com/2020/06/42605546642.pdf
    • https://nanajubedod.files.wordpress.com/2020/05/31026018577.pdf
    • https://fiwukezebara.files.wordpress.com/2020/06/20583696390.pdf
    • https://kuzelelete.files.wordpress.com/2020/06/34525467587.pdf
    • https://gefanopo.files.wordpress.com/2020/06/38046098333.pdf
    • https://tesukejiget.files.wordpress.com/2020/06/89125806587.pdf
    • https://nodezebibun.files.wordpress.com/2020/06/46998676825.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_off00008998.bin
e7399a1c5aa337c73f230c7e468636390e2024fdd34dd7c73620ec547bbefd0a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8998 11820 bytes

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