Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b82f4137d9d24f7…

MALICIOUS

PDF

74.2 KB Created: 2021-02-12 00:39:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: fa6bb9d9f24341327396f3c26e84dede SHA-1: 90f0c2da9fed9ed4acc01b91bb2d5acb12e0b70b SHA-256: 6b82f4137d9d24f72c6bdc7f1d30d54ff889ee7ec68e2851f90942b053eb41c6
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 links, with many pointing to disposable domains and exhibiting characteristics of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious 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://seumenha.ru/123?utm_term=port+richmond+high+school+rating PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4373241/normal_6016bc39194d4.pdfIn PDF document text
    • http://helper-badges.com/468229995704g6qx.pdfIn PDF document text
    • http://alcozerox.com/pull_him_out_level_80v7ftd.pdfIn PDF document text
    • http://resimpub.com/business_correspondence_letters_faxes_and_memoso8mm3.pdfIn PDF document text
    • http://varnisvakq.ru/992332442465tgik.pdfIn PDF document text
    • http://itash.space/nolakam7451.pdfIn PDF document text
    • http://mrt-zdes.ru/305006146942yrar.pdfIn PDF document text
    • http://brumbum2.xyz/telesis_merlin_softwarekc18e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409420/normal_6014bd857c7fd.pdfIn PDF document text
    • http://swiss-family.space/bucket_truck_trainingj6scz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vubalek.epizy.com/resilient_sheet_flooring_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/12576770628.pdfIn PDF document text
    • http://tiwadelir.rf.gd/classification_of_living_things_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pasawexawinogad/dosokeviwovikekumed.pdfIn PDF document text
    • https://s3.amazonaws.com/fidefofudi/instagram_direct_apk.pdfIn PDF document text
    • http://perimomu.epizy.com/ages_and_stages_social_emotional_questionnaire.pdfIn PDF document text
    • http://kugezukakig.rf.gd/75614029510.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d842.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD842 5024 bytes
SHA-256: 774f01a6419e09167b22324c1d7f33da5000499cb9bee6a911e3f160194ac842
font_01_sfnt_off0000e917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE917 10776 bytes
SHA-256: d383be4a45b4a54ebabd4d0d99645727b3fe5cbd4970eae2226508fa94faf7c1
font_02_sfnt_off00010d7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D7F 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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