Malicious PDF — malware analysis report

Static analysis result for SHA-256 77ae336e79ef0253…

MALICIOUS

PDF

91.3 KB Created: 2021-04-11 22:39:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 7969e953e5f67b529b55ddbb7c1be02e SHA-1: e1d1b4e6274947ab1078add11c5a84fa35fd41fe SHA-256: 77ae336e79ef025389ccefa7c7cfe040d2ac3b3776dff00706ed114b67fa7965
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was identified as malicious by ClamAV and an ML classifier. It functions as a link farm, containing numerous external URLs, with one prominent URL pointing to 'mezovuduw.ru'. The PDF structure suggests it's designed to redirect users to potentially harmful content, likely for phishing or malware distribution. No scripts were extracted, but the presence of multiple external links and the ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://mezovuduw.ru/strik?utm_term=a+la+recherche+du+temps+perdu+proust+commentaire PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4444850/normal_60355f22d170f.pdfIn PDF document text
    • https://kixefumikek.weebly.com/uploads/1/3/1/4/131437490/213348567b833b8.pdfIn PDF document text
    • https://borerejo.weebly.com/uploads/1/3/4/0/134040615/kivuvami.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424645/normal_6007446eb1476.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444655/normal_5ff3566c9876e.pdfIn PDF document text
    • http://bobujopolodusol.mygamesonline.org/plural_nouns_exercises_with_answers.pdfIn PDF document text
    • https://kewojuposadut.weebly.com/uploads/1/3/4/3/134374438/fe0283bee89.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458837/normal_5fd921706198c.pdfIn PDF document text
    • https://wumotobu.weebly.com/uploads/1/3/4/3/134370577/vuduzafosot_zugosiza_xewekobarix.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/brahmastra_maths_book_download.pdfIn PDF document text
    • http://moxupasasitote.mywebcommunity.org/66256937353.pdfIn PDF document text
    • https://milafesubori.weebly.com/uploads/1/3/4/7/134745217/2c53fecab8.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/d7f04be2-6bf5-4d78-927d-2a72db63348a/tazuwevafenejekujixugeg.pdfIn PDF document text
    • https://6bb2b61b-82bf-473b-8365-63ddb02ddbdd.filesusr.com/ugd/d55797_1db504a9bfe24679acb3347541db364b.pdf?index=trueIn PDF document text
    • https://9005a25f-7293-4a73-bb0f-bc58e8c16807.filesusr.com/ugd/e3834b_905235efee014ef792015549d567cb73.pdf?index=trueIn PDF document text
    • http://pusebirenox.myartsonline.com/human_anatomy_lab_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6fe473b9-be1b-43e3-8338-e6380c3b33f9/dongri_te_dubai_marathi_book_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f4f2a0b4-4b28-4291-b85b-77b6113efd84/13312817392.pdfIn PDF document text
    • https://0f926834-650c-4d5a-b53c-ad60ae412ccc.filesusr.com/ugd/6a44d8_540a1806d6cb431586f65c98ded10f98.pdf?index=trueIn PDF document text
    • https://b46c4cda-4951-41c0-816f-bbf02eee4d9b.filesusr.com/ugd/4ff992_92eb5a7124c9457a98c4d70bae54b456.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a2328fd-2455-45ec-bf23-ca8125c27a1e/sizebewepesizu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d0f6aa-a3af-4202-9f4d-54dfba5eb2fd/75310424031.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_off00011483.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11483 4248 bytes
SHA-256: 7b2e4523d642ec486c9d55ce883289937ebe65e0ac02503a43121d7f9e032c5c
font_01_sfnt_off00012392.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12392 5300 bytes
SHA-256: 1f08f05c5039d5a5f32bf13a1a3fbe63bfd044b48f446d7bddae6c60982f1542
font_02_sfnt_off00013569.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13569 12828 bytes
SHA-256: 27c36a9a8b50d74ab71f04ab78c23323487cf2dbddee7fb1e48c0d5cb668a635

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