Malicious PDF — malware analysis report

Static analysis result for SHA-256 76002a74a7117ca9…

MALICIOUS

PDF

75.1 KB Created: 2021-03-06 23:01:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 4691dc59b663f8fdf9950782483eeaba SHA-1: 42c78fc7c6c55607f6830362c808fc8dfce6e79a SHA-256: 76002a74a7117ca9c763772bcb637254b05429144511fa66043a28ec7a1e8a07
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 pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ClamAV detection and ML classifier strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document, likely delivered via spearphishing.

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://pelibifir.ru/strik?utm_term=ti+34+multiview+calculator PDF link annotation
    • https://towipikegogu.weebly.com/uploads/1/3/4/6/134690187/teturu.pdfIn PDF document text
    • http://sizoxuk.22web.org/what_year_did_a_river_runs_through_it_come_out.pdfIn PDF document text
    • http://okrasote.info/141862152452ldlk.pdfIn PDF document text
    • http://the-job.ru/496593536108e4aq.pdfIn PDF document text
    • http://henrysavbr.site/los_verbos_en_ingles_y_espaol_en_pasado_presente_y_futurouujsm.pdfIn PDF document text
    • https://dowazulipogopu.weebly.com/uploads/1/3/4/3/134322731/1e261b0954.pdfIn PDF document text
    • https://kipejuxi.weebly.com/uploads/1/3/2/6/132682137/burojavevurovomuwoge.pdfIn PDF document text
    • https://rawuvuxa.weebly.com/uploads/1/3/4/0/134019107/piwebamezuze.pdfIn PDF document text
    • https://vokefuda.weebly.com/uploads/1/3/4/7/134709273/dumow_basitowosujaz.pdfIn PDF document text
    • http://shoop-fp.ru/sesevogavul0jdd.pdfIn PDF document text
    • http://semengergel.ru/2004_honda_civic_ex_maintenance_required_light_resetorvpq.pdfIn PDF document text
    • https://pebajubidu.weebly.com/uploads/1/3/1/3/131383648/xifamezotagof.pdfIn PDF document text
    • https://rodedewosesuge.weebly.com/uploads/1/3/6/0/136010241/8381987.pdfIn PDF document text
    • https://femodamokej.weebly.com/uploads/1/3/4/5/134529999/2601673.pdfIn PDF document text
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/1046738.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/0a9bc5f7-4b85-4991-a4c9-7fe5151338c2/49936426770.pdfIn PDF document text
    • https://b84c3727-5d5a-4c5d-9d5d-21cac87b3a69.filesusr.com/ugd/fdd6c2_cd30eaa6f06841d6aa5c305f1a7039aa.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5c60354-f724-4317-b353-718cb9c7a7d7/timowubuwonigin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/391e094a-9ac8-4783-9f7c-91753c4b9e1e/2611170171.pdfIn PDF document text
    • http://zemesimeboxi.epizy.com/que_se_necesita_para_ser_anestesiologo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a07bde65-cb0e-4394-a080-3fda224b3ea3/xuxojasog.pdfIn PDF document text
    • http://bikemeno.rf.gd/sapus.pdfIn PDF document text
    • https://2a4c341d-9af7-4f89-b48a-1b926ad6ced7.filesusr.com/ugd/dd6616_d6960a50f39b4afabfa584b6177a8c55.pdf?index=trueIn PDF document text
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_22073798f221492e8822a6175b84cbf6.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_off0000e8a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A7 5120 bytes
SHA-256: 8c0019e5a06f71ec82a66245844ed060ebfc836a1e40592c1c0d04c52da25042
font_01_sfnt_off0000fa18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA18 10984 bytes
SHA-256: e106ad72ed6e5df5d4742c1537dc4e0ad2b8931f09477c60c4f2c60916dad16e