Malicious PDF — malware analysis report

Static analysis result for SHA-256 4cae24924ec978aa…

MALICIOUS

PDF

82.2 KB Created: 2021-05-19 06:13:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8a62406d1614b7c5e4024fff8bdaae73 SHA-1: c129bfcf6bf313b200cb0efee8d4015251b48426 SHA-256: 4cae24924ec978aa55bcc82238e6dc610eaa2440460d4687cfde207694124ed3
206 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF document exhibits characteristics of a phishing lure, specifically a payment redirection scam. It contains numerous embedded URLs, many pointing to disposable hosting or link farms, designed to redirect users to malicious sites. The heuristic 'SE_PAYMENT_REDIRECT_LURE' strongly indicates the document's intent to deceive users regarding financial transactions. While no scripts were explicitly extracted, the presence of external URIs and the ML classifier's high confidence score suggest the document is designed to exploit vulnerabilities or trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • LOLBin token sequence in document text high SE_LOLBIN_RUN_COMMAND
    Extracted document text contains a Windows script/execution tool name (PowerShell, mshta, cmd, rundll32, regsvr32, …) within 220 characters of a dangerous flag, command verb, or URL. This is a visible 'run this' instruction in HTML/PDF/RTF lure bodies, or — in macro-laden Office files — the macro's own string-pool entries appearing adjacent in extracted text.
  • Payment redirection / bank-detail change lure high SE_PAYMENT_REDIRECT_LURE
    Document describes new or changed bank, wire, ACH, IBAN, SWIFT, or routing instructions — a high-value business-email-compromise 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://bologen.ru/strik?utm_term=stop+process+windows+10+cmd PDF link annotation
    • http://tifizifojaf.iblogger.org/hd_video_recorder_apk.pdfIn macro / runtime command snippet
    • https://cdn-cms.f-static.net/uploads/4453901/normal_60396aa5363eb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423189/normal_5fff9612030bc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4493876/normal_5fefb5ffa28c3.pdfIn PDF document text
    • http://rutekotugu.22web.org/vurawumarujavusis.pdfIn PDF document text
    • http://vigorutijiwek.22web.org/after_we_fell_book_summary_spoilers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382414/normal_5fe82b1344889.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381730/normal_5fd943dc44e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392444/normal_605850a28ccd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416496/normal_6068b9f7b3fbe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415526/normal_5ff7132550022.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450517/normal_6003e14d13f58.pdfIn PDF document text
    • http://pubaninuw.22web.org/37745688177.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369922/normal_5fdbc24c8247b.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/5d26abde-1ccc-484b-8227-415787e0263b/82273563725.pdfIn macro / runtime command snippet
    • http://pavefobigemaxe.rf.gd/42687726859.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/12764335706.pdfIn PDF document text
    • https://s3.amazonaws.com/paxuvagal/wetofukosajovat.pdfIn PDF document text
    • https://s3.amazonaws.com/radubozufiwo/1517593603.pdfIn PDF document text
    • https://s3.amazonaws.com/bipepezuwed/20178665457.pdfIn PDF document text
    • http://fimomisuv.rf.gd/dragon_masters_books_in_order.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/867f06c4-6056-42af-8263-225db2701a00/sisetewirumuji.pdfIn PDF document text
    • https://s3.amazonaws.com/lijopavexanuse/49618104226.pdfIn PDF document text
    • http://nolivajujereram.rf.gd/hannover_rck_annual_report_2016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b0f8d79-ee2e-441c-ba6d-0f143607f2e8/machine_learning_interview_questions_medium.pdfIn PDF document text
    • http://dozazorixogope.epizy.com/mechanism_of_action_of_antimalarial_drugs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78a43d2e-453b-4baa-84d6-30f3a3283f0e/vojuzubabugunuruzigevikav.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_off0000ff79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF79 5364 bytes
SHA-256: 02ad327abe4cb41d322e04b9d2e6a8388ad81762f920fa333fe2c691b90ba72f
font_01_sfnt_off000111c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C3 12312 bytes
SHA-256: 425850620af82bdc4efbf2aeb3dc6c0419d16bddb09a8d4de4c24ef69f40a393

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