Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ed7cbd85b3933c2…

MALICIOUS

PDF

74.4 KB Created: 2021-03-18 07:31:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 037373c576737e32930cf2ec1e63ad74 SHA-1: afbc8f40539edff6cef1fd3de69f25cb2476a65e SHA-256: 4ed7cbd85b3933c2c1a77a8d00b04a02519000ed036e77cc75e83421450dde90
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of external URIs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://baarspo.ru/wix?keyword=resignation+of+power+of+attorney+form PDF link annotation
    • http://vizilirudigub.getenjoyment.net/old_school_hip_hop_dance_names.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377388/normal_5ff0176070d7e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492278/normal_5fd649169b68f.pdfIn PDF document text
    • http://tevajevidiwa.22web.org/7058270049.pdfIn PDF document text
    • https://jinunezig.weebly.com/uploads/1/3/4/3/134308797/zenaludezurovimop.pdfIn PDF document text
    • https://wazexusevawixi.weebly.com/uploads/1/3/0/7/130776334/fumapobalizi_vulefapu.pdfIn PDF document text
    • http://kopuvimu.scienceontheweb.net/dotube.pdfIn PDF document text
    • http://samafutanub.mypressonline.com/math_101.pdfIn PDF document text
    • http://lenagilos.22web.org/barrena_manual_para_perforar_pozos.pdfIn PDF document text
    • http://pizuwujigajanen.medianewsonline.com/electrolysis_of_acidified_water.pdfIn PDF document text
    • https://lumovomudin.weebly.com/uploads/1/3/4/7/134704265/5226fb114c812f7.pdfIn PDF document text
    • https://dudasajaje.weebly.com/uploads/1/3/4/3/134362454/c3c1ef6b6.pdfIn PDF document text
    • http://timinome.getenjoyment.net/34981283568.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/xazarujokemus/2003_lexus_is300_2jzgte_swap.pdfIn PDF document text
    • https://s3.amazonaws.com/kizugokofo/how_much_oil_does_a_honda_trx_250_take.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/what_causes_eczema_on_fingers.pdfIn PDF document text
    • https://s3.amazonaws.com/tubupejevomo/71097644384.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_off0000e6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E9 5388 bytes
SHA-256: 4103c024dbbd732f5fd274dfe729a101b9bc5fa4b57c261c2519f7bba7e26249
font_01_sfnt_off0000f94f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94F 10320 bytes
SHA-256: 93cc31bee4a511c24558ad8c159f525ae6dee0d2983e7a10b10ae9b87d38eb0f

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