Malicious PDF — malware analysis report

Static analysis result for SHA-256 b62251c7a25577b1…

MALICIOUS

PDF

82.0 KB Created: 2021-04-08 00:09:44 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: a85df57e7512b3db3b6007b80dd40325 SHA-1: 43dbc233d442404116ab5076dae20179f85a8032 SHA-256: b62251c7a25577b1b8b8b41c1337400e34c9a51897424b11c082b19f31dc205f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO poisoning tactic. The primary URL, 'https://resalured.ru/123?utm_term=cerfa+vente+v%25C3%25A9hicule+d%2527+occasion+pdf', appears to be a lure for vehicle sales information. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, likely to redirect users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/123?utm_term=cerfa+vente+v%25C3%25A9hicule+d%2527+occasion+pdf PDF link annotation
    • https://vipagavufedolaz.weebly.com/uploads/1/3/5/3/135350232/2166238.pdfIn PDF document text
    • https://tumokisomagen.weebly.com/uploads/1/3/4/8/134897409/6313722.pdfIn PDF document text
    • https://devudupaf.weebly.com/uploads/1/3/4/8/134880603/5970639.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390051/normal_5fd898cdf2a3f.pdfIn PDF document text
    • https://movadopudi.weebly.com/uploads/1/3/0/9/130969115/finelugezelose_mebovuxixagol.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/sabamezom.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4461791/normal_5fc7b466e4ab1.pdfIn PDF document text
    • https://zamovolipizutuj.weebly.com/uploads/1/3/1/0/131070940/8236996.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446379/normal_5ffab059af450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479439/normal_5fd9975c29c7b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464715/normal_6030898073d85.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368504/normal_60465a8e3acb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387229/normal_606dcef5b44ee.pdfIn PDF document text
    • https://polokerukoxabuv.weebly.com/uploads/1/3/4/4/134456912/wowesumupofud_lulosos_divovumazu.pdfIn PDF document text
    • https://malabukepi.weebly.com/uploads/1/3/0/9/130969546/tegakonabadema.pdfIn PDF document text
    • https://zurukuwimuso.weebly.com/uploads/1/3/4/3/134325804/b8b9b5d.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/a94134d0-9e29-4519-a556-6c4b5006de45/champion_4500_watt_inverter_generator_reviews.pdfIn PDF document text
    • https://e1ca4115-fb55-43f9-84f1-eaf814f8c83f.filesusr.com/ugd/18122d_29da1196fee040e5868ec26b01a34e84.pdf?index=trueIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_b87bfe50bf314fce9028ba05a35d728b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d92eb9d4-9f41-4acd-a78a-e9d496fc4337/bushnell_scout_1000_arc_laser_rangefinder_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5a8c9d6-2f77-4ba9-91e1-a77aaa206941/pdf_converter_professional_for_windows_10_free_download.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_off00010123.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10123 5384 bytes
SHA-256: a9cfa609ca08394e0fcabc1ce27b51d03c5ad4fbc542c181f097c8eb86f2ca11
font_01_sfnt_off00011336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11336 12464 bytes
SHA-256: c36554510b7543f92388c0f325508b87130001ba6336be4429e00f37456cfd4b