Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ca8d57a6b814c14…

MALICIOUS

PDF

39.7 KB Created: 2020-11-08 18:36:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-01-23
MD5: d95b7386944fe647e2d74a76123a70c2 SHA-1: fdef86797f9df5aba6eb2dce26c93e8344195a06 SHA-256: 1ca8d57a6b814c14e9697b0fe210d00ca54b6069c46b8d3bc4e3590529cfb51f
126 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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 https://traffset.ru/aws?keyword=epson+wsd+scan+app PDF link annotation
    • https://takoxoja.weebly.com/uploads/1/3/4/3/134371043/3459152.pdfIn PDF document text
    • https://finazodaxuvoj.weebly.com/uploads/1/3/2/6/132682535/favegunupisan.pdfIn PDF document text
    • https://luwinititik.weebly.com/uploads/1/3/4/5/134587042/d2e95db4f6e9ac3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/angelica_zambrano_2020.pdfIn PDF document text
    • https://likuzow.files.wordpress.com/2020/11/40264502684.pdfIn PDF document text
    • https://bixirofu.files.wordpress.com/2020/11/88022950773.pdfIn PDF document text
    • https://bosujukekaru.files.wordpress.com/2020/11/open_source_bookmark_editor.pdfIn PDF document text
    • https://s3.amazonaws.com/bofake/grace_brethren_christian_school_clinton.pdfIn PDF document text
    • https://nodumizid.files.wordpress.com/2020/11/wave_optics_class_12.pdfIn PDF document text
    • https://tegorijike.files.wordpress.com/2020/11/kogama_hack_gold_and_silver_generator.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005b9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5B9A 4988 bytes
SHA-256: 64fad63837667d1e5cbe4ea5f510db16f53e15c83910bd87d4a57e12f5bf4935
font_01_sfnt_off00006cba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6CBA 10996 bytes
SHA-256: a7eadae3a432d9946eeddd9a625959108cb4a1c7da5d9e3c6c0057a47928f59f