Malicious PDF — malware analysis report

Static analysis result for SHA-256 7bb7d4c944d2d65b…

MALICIOUS

PDF

77.2 KB Created: 2021-04-04 04:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: d23099b9b143755fc3231ee2a3372fdb SHA-1: ab5f28338497aaf1393d484460c55a129d37a9fc SHA-256: 7bb7d4c944d2d65b53ec20e17c701402a3fd4e5b006de0e7316cc76f5990c273
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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/123?utm_term=free+shorthold+tenancy+agreement+template+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4475208/normal_601a3ab3b8e98.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424347/normal_604ba5b64af04.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367645/normal_5ffc726570a61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_6025f3750f3be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481671/normal_60212bca6d59d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446776/normal_60293e911145f.pdfIn PDF document text
    • http://vaxiliwu.medianewsonline.com/gupebonatekowewulaku.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455180/normal_5feb79fcef8af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377113/normal_6018eb1c261c5.pdfIn PDF document text
    • http://mukinokelek.mygamesonline.org/role_of_biotechnology_in_food_processing.pdfIn PDF document text
    • http://zugobopepoj.sportsontheweb.net/duxusitidilamulov.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408321/normal_60553574b72a0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453747/normal_6045e62e26140.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384150/normal_6018d0379d33a.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/lilivatuzipolasutumixik.pdfIn PDF document text
    • http://zixudivibudizu.scienceontheweb.net/28101731771.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415537/normal_603428d63cf42.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bopuxosavubare/75505694517.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/pace_university_math_placement_test_answers.pdfIn PDF document text
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_5552c779636b47f6ab13e9e1c258c165.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vuraradaso/wanitelegufugov.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawe/kunefobanofoninaxe.pdfIn PDF document text
    • https://aa514bbb-a96e-4bc9-8ff3-0ca2edd1104f.filesusr.com/ugd/3fc21f_c94fac563a1d49c0869ebade0a7fb338.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/93413341825.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_off0000edf0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF0 5608 bytes
SHA-256: f153134314e040e8b8c470a1a172c964eaab820df5171a9e4188f3658e1ed082
font_01_sfnt_off000100e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100E4 11252 bytes
SHA-256: 2ff57899acead9dc204df82fc87c8673b40a69e73218af99bdf56c3c2bfb846f