Malicious PDF — malware analysis report

Static analysis result for SHA-256 77923ffe0d48256d…

MALICIOUS

PDF

76.4 KB Created: 2021-04-16 10:17:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: 6e3ca0958dbccc0cdd47707032ec47a6 SHA-1: 2c79c072b9cc62ebae2fb5917f1bc95609d1b41f SHA-256: 77923ffe0d48256dbd0871c7bcc11ca0fa15d71adce8d76b68e1350a45faeb38
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution attack pattern.

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://soxebez.ru/strik?utm_term=will+running+lean+damage+engine PDF link annotation
    • http://raxewapikeb.mygamesonline.org/toyota_camry_xle_for_sale_2019.pdfIn PDF document text
    • http://bexukavinawexov.mygamesonline.org/letter_a_worksheets_preschool.pdfIn PDF document text
    • https://fugikoji.weebly.com/uploads/1/3/4/6/134611078/aa49321.pdfIn PDF document text
    • http://xagixowedobosab.medianewsonline.com/85540024448.pdfIn PDF document text
    • https://segunimumise.weebly.com/uploads/1/3/1/0/131070895/tapimutobiza.pdfIn PDF document text
    • https://xotozefubineru.weebly.com/uploads/1/3/4/5/134576546/5068015.pdfIn PDF document text
    • https://fowidejufato.weebly.com/uploads/1/3/4/5/134582967/xomejukubir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445103/normal_5fc571884a665.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368466/normal_6003d36d9d086.pdfIn PDF document text
    • http://tixesikixux.mygamesonline.org/30367606437.pdfIn PDF document text
    • http://rijigikesezaga.mypressonline.com/rsmeans_building_construction_cost_data_2020.pdfIn PDF document text
    • https://xulijijexam.weebly.com/uploads/1/3/1/4/131453336/rudunofiwuxaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377098/normal_601f6aeb71784.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/5049932.pdfIn PDF document text
    • https://dosasefezopalan.weebly.com/uploads/1/3/1/3/131398547/1206871.pdfIn PDF document text
    • https://poxawakepuk.weebly.com/uploads/1/3/1/6/131606289/tebigewasepi.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/014fc1be-5e22-4b3c-913c-f93c436b0230/bunn_axiom_coffee_maker_instructions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fefcda2c-03e5-489e-803b-009bdb296dfc/lojibu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc63973-6b7b-42f5-97e2-c0344dbf59b2/33529427447.pdfIn PDF document text
    • http://wukevivetarapu.myartsonline.com/amtrak_routes_map.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ec5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5E 4980 bytes
SHA-256: a71833c58607c26490fe5fef66d4b73119558f159e9257bb1953b61c8f27b4ca
font_01_sfnt_off0000fd43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD43 11100 bytes
SHA-256: 03212742fc2f12f9df0284885f1f0f92d9d067faf0729de9699a2ff9cf0e3aae

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