Malicious PDF — malware analysis report

Static analysis result for SHA-256 f8cd5c73f7603d46…

MALICIOUS

PDF

59.2 KB Created: 2020-10-09 16:47:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-10
MD5: 1da29e3bf9157fbf61315fbe535d9b6c SHA-1: 72d96332b4cabb5b724306c714ccf8788b631128 SHA-256: f8cd5c73f7603d468e4255101b322626658f33bd09de23b4cf078dac9c0e6f3e
184 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://ggtraff.ru/strik?keyword=el+salvador+bandera+nacional In PDF document text
    • http://files.kalliejo.com/uploads/1/3/2/6/132682070/3164225.pdfIn PDF document text
    • http://files.vindomoracountrylodges.com/uploads/1/3/1/0/131071209/biropazazotinijo.pdfIn PDF document text
    • http://setigijo.tcdcllc.com/uploads/1/3/2/6/132696021/941864.pdfIn PDF document text
    • http://zapiwu.utahproaudio.com/uploads/1/3/2/6/132682076/rinosanudax.pdfIn PDF document text
    • http://files.turkeycreekretrievers.com/uploads/1/3/2/6/132681362/d9b4dcb7877.pdfIn PDF document text
    • http://xuvupeda.mikewmorgan.com/uploads/1/3/1/6/131637873/6915400.pdfIn PDF document text
    • http://files.folliclesalon.com/uploads/1/3/0/9/130969725/57bffa736321.pdfIn PDF document text
    • http://jamosifu.holytrinityschoolmervue.com/uploads/1/3/1/0/131070272/ruxega_nujiwemuv_rebevafisu.pdfIn PDF document text
    • http://files.joaquinperezortega.com/uploads/1/3/1/4/131438176/31377ae.pdfIn PDF document text
    • http://files.tnquarterhorsesales.com.au/uploads/1/3/0/9/130969154/1887962.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/74e9b086-bb67-46c1-ab32-ed005ab9f583/numovigamumeworar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e49d0a8-cbab-4b15-957c-b3ee8e0a5c67/6737191638.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0488/0321/7573/files/can_fish_have_backbones.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0495/5157/3144/files/40560244713.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_off0000a847.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xA847 5092 bytes
SHA-256: c4c36f860b2e9124cc5f059bb0c0c467a69fa1ee8b1f1f1dd65d875c71c0f611
font_01_sfnt_off0000b9a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9A7 11244 bytes
SHA-256: f58d5dfc0072649c1328249640a9aa7f971cb7e403be2be1ae0a93ac98dc84fa