Malicious PDF — malware analysis report

Static analysis result for SHA-256 113d0c4b9178f046…

MALICIOUS

PDF

76.4 KB Created: 2021-03-04 15:07:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 786fa0dfe9cefcd9db33c8acc8154017 SHA-1: c5bf9d42ba32859a9253ba54148314280aa7d489 SHA-256: 113d0c4b9178f0469fa3a6be38d05a28504b00ce27bfdc7464d8101714e92257
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to external, potentially malicious, sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/strik?utm_term=what+is+definition+of+curriculum PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4485828/normal_600d8538a550c.pdfIn PDF document text
    • http://snapchat-alert.com/english_placement_test_for_young_learners6y7eo.pdfIn PDF document text
    • http://xozonline.ru/tanofatuvozevaxoteaiuk.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446496/normal_5ffe2a16dfae6.pdfIn PDF document text
    • https://radojevujexoki.weebly.com/uploads/1/3/1/8/131871685/791cc2df20.pdfIn PDF document text
    • http://driveformclanemilwaukee.com/vehicle_information_londonl0c7j.pdfIn PDF document text
    • http://getcabinets.xyz/12524471008iuk0m.pdfIn PDF document text
    • http://vizit.store/plastic_deformation_definition_bone7um2p.pdfIn PDF document text
    • http://natnat.fun/floral_background_invitation_templatejqm73.pdfIn PDF document text
    • https://pogeruriwijo.weebly.com/uploads/1/3/4/3/134340707/xugiwa_vubezeke.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470387/normal_603016d9ef337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501206/normal_5fe8a14956f09.pdfIn PDF document text
    • http://komarovskii.xyz/ravofnehye.pdfIn PDF document text
    • http://ital-girl.space/wiviritedofamikiwevaxijkx6t.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425230/normal_5fe2974f13f6a.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/kevava/pago_cedula_catastral_informada.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/addition_of_fractions_with_unlike_denominators_worksheet.pdfIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_74e4581b7c3341249c6dc56777ca1c73.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bomupi/birthday_photo_video_editing_app.pdfIn PDF document text
    • https://b9eb3541-094c-4606-b101-17c2291fd6e1.filesusr.com/ugd/a18601_bca2e233dade4ab6af23ef8f69e6050e.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_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 5272 bytes
SHA-256: 37a594c40626ad5187b78968c65b5038dcf895e413261a1146f15cd3d50902dd
font_01_sfnt_off0001019f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1019F 10152 bytes
SHA-256: ffdfcd946bb6d57aff88118ca2d47fbf0d5b97426a52dfdded5cca26d149dd9d

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