Malicious PDF — malware analysis report

Static analysis result for SHA-256 1af4e6474bbdecdb…

MALICIOUS

PDF

79.5 KB Created: 2021-05-15 19:45:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 06e7cdef38b339e9b7d31562865576cb SHA-1: 9ae705d515652f07686f28d827589be2793e4f8a SHA-256: 1af4e6474bbdecdb1710e55437b45ba0b587d888b36624ac92e9b6a193e6500d
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/strik?utm_term=nortel+networks+t7316e+feature+codes PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4386079/normal_6014cd16c1e01.pdfIn PDF document text
    • https://pusasosabuni.weebly.com/uploads/1/3/4/6/134654602/8144238.pdfIn PDF document text
    • https://cdn.sqhk.co/tisufupujeli/qgjjkji/muwakaziketekuxomarixa.pdfIn PDF document text
    • https://cdn.sqhk.co/vameduvide/hcylih5/yellowstone_national_park_lodging_official_website.pdfIn PDF document text
    • https://funesovikigaje.weebly.com/uploads/1/3/0/7/130740183/zedegi-zofufulip-kanadi-newenivilez.pdfIn PDF document text
    • https://nenonafadigis.weebly.com/uploads/1/3/4/8/134856929/difeg_ravumom_kisaxobazok.pdfIn PDF document text
    • http://joraxabe.iblogger.org/digestin_y_absorcin_de_protenas.pdfIn PDF document text
    • https://cdn.sqhk.co/negapevu/ijdCdkX/67287556810.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456135/normal_6059d357ad94e.pdfIn PDF document text
    • https://cdn.sqhk.co/laxuweredex/ejejgjd/english_grammar_book_for_beginners.pdfIn PDF document text
    • https://gisonegeviwobi.weebly.com/uploads/1/3/1/3/131383673/danikatenijin_sugitu_zurajubigen_tomijuju.pdfIn PDF document text
    • http://sevotapapi.22web.org/11980966419.pdfIn PDF document text
    • https://pogosarixuxa.weebly.com/uploads/1/3/0/7/130776079/8814e20d2a.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/ef5611a2-e531-4402-a3e0-b3a71326a442/fodavosudibinitekekubimi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/765d504f-d89e-4aaf-ba02-a33ec106dfa7/puduwifuvovosefukesago.pdfIn PDF document text
    • https://2386e270-bd20-42c1-b3e5-1ba7eaa1d68d.filesusr.com/ugd/b4f0c6_ef1009f95b584549bce0167297757f51.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/87ae52c9-4479-4f1e-8975-7ed48ec54b76/telotugikolit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23b6fa85-490e-4e8d-b6a8-32a416d4bcab/pofanavenameletididujovof.pdfIn PDF document text
    • http://vapefovofip.epizy.com/38862136745.pdfIn PDF document text
    • https://c84ffda1-e72a-45fa-8ce8-a771970cf326.filesusr.com/ugd/9fd656_d27983ef28b64899aa4aace967c136c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/52ca6905-9de0-49a3-9e26-abd486da65fa/vicks_cool_mist_humidifier_not_working.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_9fef2ecb44944ffd988717e1b4dcbc69.pdf?index=trueIn 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_off0000f71a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71A 5588 bytes
SHA-256: f15802692cf49adb2b458a5f7109abf8018fd729d95ac11bd3dda786dc56d485
font_01_sfnt_off00010a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A4F 10792 bytes
SHA-256: 90f85edbc85c65206c474e738f76045e257cdba6f45b8ce7900288057b9befe7