Malicious PDF — malware analysis report

Static analysis result for SHA-256 f739235bc60b487d…

MALICIOUS

PDF

34.9 KB Created: 2020-10-07 21:26:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-17
MD5: 4859de02c0308adf8cdab197faaa547d SHA-1: 5c8d6845a1f3e3c20b39396ecabafb28ee8e5f66 SHA-256: f739235bc60b487d6552aab30b451dd31f01de458e87d342b6339e76d264eb11
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=harvard+business+case+studies+pdf+fr In PDF document text
    • https://site-1036702.mozfiles.com/files/1036702/32072340101.pdfIn PDF document text
    • https://site-1037180.mozfiles.com/files/1037180/18561357687.pdfIn PDF document text
    • http://files.banningchiropractic.com/uploads/1/3/1/0/131070161/rofoxopi.pdfIn PDF document text
    • http://files.santebarleyphils.com/uploads/1/3/1/0/131070572/tupokaroz-pavevuw-xiporukuno.pdfIn PDF document text
    • http://salukurov.my-early-morning-thoughts.com/uploads/1/3/1/3/131398368/1463938.pdfIn PDF document text
    • http://zokiwerin.callahansclassroom.com/uploads/1/3/2/6/132695306/1346064.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/f8f451f8-f81b-40e4-ba4b-b9584375f385/94891475337.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cabf8b68-d033-4665-9ded-769b7e1ae13b/wufojowapex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca916fca-beff-43bc-add0-70f2d064dc74/loburix.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0427/6633/6166/files/fraction_in_word_equation.pdfIn PDF document text
    • https://cdn.shopify.com/s/files/1/0435/7770/4607/files/thin_diamond_band_gold_engagement_ring.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_off00004c72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x4C72 5276 bytes
SHA-256: a1f63f0694554271efe5b6f274807a8d19f8b647ae3cd5d6f793c621fdbaaa56
font_01_sfnt_off00005e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x5E73 9532 bytes
SHA-256: 8768ec05a19ad865d12fee3159a145001686353680fd933c0a0ee3fa3ae897ca