Malicious PDF — malware analysis report

Static analysis result for SHA-256 93c89c3b10728d48…

MALICIOUS

PDF

77.8 KB Created: 2021-01-22 11:02:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 09babbc7fa355dd0231cf6ebbc444045 SHA-1: 906516c4495b354bc14c9b66972376cb9040d256 SHA-256: 93c89c3b10728d4802b0bfe58a15499730ddfcfdcdb9dd498f8cea0285d8e22b
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded links that redirect to known malicious infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The ML classifier and ClamAV detection strongly suggest malicious intent. The file's purpose appears to be redirecting users to potentially harmful sites, leveraging a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffmen.ru/123?utm_term=mec+real+estate+term In PDF document text
    • http://kitigaw.22web.org/74964111622.pdfIn PDF document text
    • https://fikanofuzak.weebly.com/uploads/1/3/1/4/131438747/1693034.pdfIn PDF document text
    • http://birodavaz.22web.org/kineleximanenifagikerotov.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374379/normal_5fcb67f3dde21.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408720/normal_600869ddd614f.pdfIn PDF document text
    • http://rilotelexewobos.iblogger.org/vertical_analysis_balance_sheet_template.pdfIn PDF document text
    • http://dudipoviju.22web.org/31008289366.pdfIn PDF document text
    • http://xipevufizokev.iblogger.org/email_templates_responsive_free.pdfIn PDF document text
    • https://tidukefawa.weebly.com/uploads/1/3/4/8/134851120/449233ed1bf2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470967/normal_5fde9134bfe34.pdfIn PDF document text
    • https://derovidexaw.weebly.com/uploads/1/3/1/3/131382126/mutikokalutawuxozol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444649/normal_5fca83fdefe7a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kebafitesulodu.epizy.com/xaxujonomaxasire.pdfIn PDF document text
    • http://sexikiti.epizy.com/45882759411.pdfIn PDF document text
    • http://kagiwabiluwotel.epizy.com/conceptual_physics_hewitt_worksheet_answers.pdfIn PDF document text
    • http://bapomel.epizy.com/25021955050.pdfIn PDF document text
    • http://gogewarixisude.epizy.com/notary_acknowledgement_form_for_florida.pdfIn PDF document text
    • http://fonawemosel.epizy.com/blob_url_video_online.pdfIn PDF document text
    • http://lojuwuwa.rf.gd/games_lego_batman_ps2.pdfIn PDF document text
    • http://tawenaxogiminax.epizy.com/62763018361.pdfIn PDF document text
    • http://jawikaginixuxuz.rf.gd/html_attributes_date_format.pdfIn PDF document text
    • http://vabizawez.epizy.com/asma_bronquial_2017.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_off0000f48e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF48E 4952 bytes
SHA-256: b215da8bdbf05c79a0c170f1a3785eecd1d39f1e87b5e4f31431ac8d1479df12
font_01_sfnt_off00010556.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10556 10324 bytes
SHA-256: faa91f5745510620811225c980ce981ac65785e0a78ee94eba355d99f4a15008

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