Malicious PDF — malware analysis report

Static analysis result for SHA-256 61f0247aa656e275…

MALICIOUS

PDF

77.9 KB Created: 2021-03-14 03:42:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: c762cded79f4fae7b32e40ac7dcf793a SHA-1: 113998bb518c7c7ce5046300b3542d1347ce9730 SHA-256: 61f0247aa656e2751f7faab07045ad6a622106a6b699a10dc3e61fba4bc7e631
244 Risk Score

Malware Insights

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

This PDF file contains a large number of embedded links, many pointing to disposable hosting and redirector infrastructure, indicating a link farm or phishing lure. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The embedded links are designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://yafferge.ru/award?keyword=advantages+and+disadvantages+of+internet+pdf+download In PDF document text
    • http://gexopidikimo.mygamesonline.org/three_capital_budgeting_methods.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453344/normal_6018ad7cd1ada.pdfIn PDF document text
    • https://toruvorunivigu.weebly.com/uploads/1/3/5/3/135317855/gabuzepivub-wotazafizevela-basodurog-lolenejukas.pdfIn PDF document text
    • https://xomowozijirogap.weebly.com/uploads/1/3/4/6/134667332/mofilupalis-gewusivegun-lajabatopomonev.pdfIn PDF document text
    • https://zuverikaniwofu.weebly.com/uploads/1/3/4/1/134108987/5904532.pdfIn PDF document text
    • http://lofajemami.sportsontheweb.net/black_and_decker_mouse_sander_pads_wickes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458125/normal_60174a7ce5ffc.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/dafajavariki_retuxo_gukufe.pdfIn PDF document text
    • https://fukagopesuzidad.weebly.com/uploads/1/3/1/3/131381553/cf79a.pdfIn PDF document text
    • https://fugunukotuji.weebly.com/uploads/1/3/4/5/134589730/naruguze-liruzerudi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470029/normal_5ff51d0a7782f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xovigukesejibem.rf.gd/momokexidijuvakozufa.pdfIn PDF document text
    • http://wufalejopasedor.epizy.com/bixunedibodur.pdfIn PDF document text
    • http://vekemelegewimo.atwebpages.com/tetoxusogivumiwapa.pdfIn PDF document text
    • https://6fd4412c-3e6e-4f21-a9af-8137ffc6c0d9.filesusr.com/ugd/03469c_fd203e694cf74fe491db5a465850ab0f.pdf?index=trueIn PDF document text
    • http://nikonujilo.epizy.com/13711925718.pdfIn PDF document text
    • http://zusobowes.rf.gd/gefubuvexevalorin.pdfIn PDF document text
    • http://vaxuxosubize.epizy.com/kms_microsoft_office_2016_free.pdfIn PDF document text
    • https://1e16f6d7-285b-4488-bf07-d3e24ac90e20.filesusr.com/ugd/417718_7fc1b5b6b66e43cea431eff698030cd2.pdf?index=trueIn PDF document text
    • https://2b08c346-38d8-4763-b559-bb9d4fff2313.filesusr.com/ugd/40c9d6_cfc2a843886140dcadef08a8505bc547.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_off0000f2c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C8 5352 bytes
SHA-256: ae126a1c96e5f27b8ebd976f125d2dbf57846ebe8c128e23a8cdfda1cf587c62
font_01_sfnt_off00010525.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10525 10640 bytes
SHA-256: bd42412e3a3504d7b9c53be6675a4119551c77084f4e9cb3ab481eb24140a19b