Malicious PDF — malware analysis report

Static analysis result for SHA-256 309ca5a5581c5eae…

MALICIOUS

PDF

84.5 KB Created: 2021-03-11 06:40:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 143a9da41855188d8821639b4305f020 SHA-1: 9fd1deb911e3d789e48b14f7bbe2bcfb0837e7d6 SHA-256: 309ca5a5581c5eae033678517905a57aac0e62d1b6bf0ab3bd237c2db3ca5862
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several pointing to disposable domains and link farms, indicating a phishing or redirection attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to lead users to potentially harmful external content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://botokaw.ru/123?utm_term=solidworks+engineering+drawing+template PDF link annotation
    • https://cdn.sqhk.co/vekazedivipi/Egjjdjg/dig_it_your_way_ball_cave.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/6gchijV/jafosowupuk.pdfIn PDF document text
    • http://boxijogirexu.medianewsonline.com/1396965897.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481836/normal_6035a9c80c12f.pdfIn PDF document text
    • https://faturigazed.weebly.com/uploads/1/3/4/8/134859690/8c0fb3.pdfIn PDF document text
    • https://dudasajaje.weebly.com/uploads/1/3/4/3/134362454/9024097.pdfIn PDF document text
    • https://majojolug.weebly.com/uploads/1/3/4/5/134595566/ligidowubesazok_sedolulizita.pdfIn PDF document text
    • http://lomidal.mygamesonline.org/nusufeli.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/icjepjf/small_cross_stitch_letters_and_numbers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4496151/normal_5ff3b149e9e22.pdfIn PDF document text
    • https://vojubewerele.weebly.com/uploads/1/3/4/0/134013512/ef399e7918cf87e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446497/normal_5fd66349ac366.pdfIn PDF document text
    • https://cdn.sqhk.co/luwiliziv/ideggij/jojajizilibem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://8641c524-1fb5-4292-87ed-dd72f64d6c22.filesusr.com/ugd/9b7d8a_2fdea2b0312343609eab366937a50bc6.pdf?index=trueIn PDF document text
    • http://kebenubes.onlinewebshop.net/sagakawokodirubof.pdfIn PDF document text
    • https://s3.amazonaws.com/sezewu/timesheet_calculator_with_breaks.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/autocad_2016_3d_tutorial_free.pdfIn PDF document text
    • http://zobuwijezad.onlinewebshop.net/what_is_an_aquifer_thermal_energy_storage_system.pdfIn PDF document text
    • https://s3.amazonaws.com/xesigeze/befiwol.pdfIn PDF document text
    • https://f1c0478e-57b3-422a-b8eb-433964b677d2.filesusr.com/ugd/16c17d_0321703b776e4388a02df62ff6f70c5d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tuxalowafokuvo/pelagijovogodol.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/pomazuxapabetolawebaxet.pdfIn PDF document text
    • https://35057dd6-1d18-4acd-96c9-af3b7fddc7cd.filesusr.com/ugd/978dd5_4880723c0aee4c339eff6ab6e98bbb71.pdf?index=trueIn PDF document text
    • https://0df6220b-9630-4647-aab6-0d9db69b9d59.filesusr.com/ugd/8b97dd_df121891aa244b02bafabe1bdaf99dde.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_off00010b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B19 5540 bytes
SHA-256: 3ea1664dd0dd6a29f75c97fcb46ec7a099c5c8afb26295415ef5b603b8249cf7
font_01_sfnt_off00011ded.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DED 11120 bytes
SHA-256: 526a1cd89a26166236848bac5760e7acda7de92f55a1445e22e33b64fda59794