Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d7545c82de3c7b8…

MALICIOUS

PDF

75.9 KB Created: 2021-04-03 22:10:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 59b32fcaf4028f244283827341b9072b SHA-1: 15214ea86e67258a16e144193a53bd67ed6909f0 SHA-256: 8d7545c82de3c7b83343cb30ae65b96fa104c81a0036510f3e9794fec34d71cb
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 0.9996

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://resalured.ru/strik?utm_term=mapa+de+riesgos+laborales+en+oficinas PDF link annotation
    • https://repemigikaji.weebly.com/uploads/1/3/4/6/134608024/munezapudiwazavuful.pdfIn PDF document text
    • https://vumokaxizojomij.weebly.com/uploads/1/3/2/6/132680848/387933.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410186/normal_6027939a34ec5.pdfIn PDF document text
    • https://muvozipiga.weebly.com/uploads/1/3/5/3/135391344/2909426.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379384/normal_5ffc83c9c840e.pdfIn PDF document text
    • https://nefabilaj.weebly.com/uploads/1/3/1/4/131438225/vekeje-pagejuvagiv-degufifikomo-xiwoj.pdfIn PDF document text
    • https://larekupexog.weebly.com/uploads/1/3/4/8/134884129/sasulipoki-lozogixaxobanu-kodawuzup.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503050/normal_603744accd03d.pdfIn PDF document text
    • https://gejeliruvuke.weebly.com/uploads/1/3/4/6/134699680/9827108.pdfIn PDF document text
    • http://tifiwijewek.iblogger.org/cholecystitis_akut.pdfIn PDF document text
    • https://cdn.sqhk.co/vinasujitupe/xUiigK9/fluxx_san_diego_instagram.pdfIn PDF document text
    • https://tekazomegi.weebly.com/uploads/1/3/4/0/134017279/paguzajope-gogerilewab.pdfIn PDF document text
    • https://dexetejitifite.weebly.com/uploads/1/3/4/5/134576896/jijulubokomegimopan.pdfIn PDF document text
    • https://cdn.sqhk.co/vusabutam/pjakih1/44421664162.pdfIn PDF document text
    • https://cdn.sqhk.co/zisenusaf/hihwfii/stiletto_nails_long_glitter.pdfIn PDF document text
    • http://juvasojiwal.66ghz.com/13068271189.pdfIn PDF document text
    • https://saworajopasu.weebly.com/uploads/1/3/0/7/130775294/geras-zukuregokafezo-jixono-gigun.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/6e5149bb-2bc8-468e-bfe8-f5c45c48c8bf/similar_figures_word_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbb07b62-f91a-42e3-a551-dade1402b3b6/50968911142.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7e704339-19d5-4f7d-81d2-f1c2eaf277e7/clases_de_guitarra_clasica_online_gratis.pdfIn PDF document text
    • http://vevugep.epizy.com/phone_number_to_pay_my_dish_network_bill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8165c7e3-49dc-4e8a-9ad6-5178fc498077/92944166898.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_off0000ec5a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5A 5468 bytes
SHA-256: 0bb5aee7c4256ec16fafe67958e2db1c93cc8cd428bbc52c03dedecdc81c34e2
font_01_sfnt_off0000ff0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF0E 10864 bytes
SHA-256: cf36e54ee59942111332596c8c2a5dea07b1bc7b27e035da2853487adec2ca67