Malicious PDF — malware analysis report

Static analysis result for SHA-256 877466612a5741d4…

MALICIOUS

PDF

74.0 KB Created: 2021-06-01 16:25:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 30c05422f78ecae1656cae9537572c19 SHA-1: a2866d5f2319113ddea939a61ec9303314b7a86e SHA-256: 877466612a5741d4279bd4f12710e2e476bb115cb917916444fdc50105a16501
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document designed to redirect users to potentially harmful content.

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://allytemp.ru/pbw?utm_term=t-tess+goals+examples PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4384037/normal_601af82454f51.pdfIn PDF document text
    • https://zajoxewamabovi.weebly.com/uploads/1/3/7/5/137503144/berit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417206/normal_601d232a4d263.pdfIn PDF document text
    • https://dowadumusisek.weebly.com/uploads/1/3/4/5/134521262/3675036.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403679/normal_6054a986f2686.pdfIn PDF document text
    • https://foxodevof.weebly.com/uploads/1/3/5/3/135336182/josuzevurefuguj_robitila_duwidoraletura_pakuw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380882/normal_60333157ca070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491159/normal_6044225719155.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407303/normal_601609a109cd2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474722/normal_601e56aa3e590.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449973/normal_601fb2694009e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sazupamufode.pbworks.com/w/file/fetch/144447330/normas_aduaneras_de_cuba_2021.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/w/file/fetch/144438024/what_are_the_classification_of_teaching_aids.pdfIn PDF document text
    • http://rugewenuzed.pbworks.com/w/file/fetch/144423462/buvirixu.pdfIn PDF document text
    • http://dejimebez.pbworks.com/w/file/fetch/144420729/the_complete_interview_answer_guide_download.pdfIn PDF document text
    • http://midevodimu.pbworks.com/f/dikova.pdfIn PDF document text
    • http://mutatalibo.pbworks.com/w/file/fetch/144427383/pekafuwuvigafuvubajox.pdfIn PDF document text
    • http://nadupodifado.pbworks.com/f/68247828396.pdfIn PDF document text
    • http://taxexuwej.pbworks.com/f/tony_buzan_hzl_okuma_yorumlar.pdfIn PDF document text
    • http://pagorevet.pbworks.com/f/o_ceticismo_da_f_download_gratis.pdfIn PDF document text
    • http://wotasaful.pbworks.com/f/sipokatodosolibelosi.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_off0000e4b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4B1 5092 bytes
SHA-256: e1fef97f6de7807e07881872ec17de01a1bc8407f42b3b44d2f011fe2c973292
font_01_sfnt_off0000f608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF608 10928 bytes
SHA-256: e36d6c8f938324ad39d92caaefa29c0e1acbd2a06820c8f8cc07ce286c59aae3