Malicious PDF — malware analysis report

Static analysis result for SHA-256 aa5796aa0aa69a0b…

MALICIOUS

PDF

83.5 KB Created: 2021-06-08 19:54:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: f8d37fe7d3699098ae14120c231d3984 SHA-1: 09bcc66847e17bf0724359b98cf85c71ade66464 SHA-256: aa5796aa0aa69a0b1839679b044632fad8657a916a97681e8158afedee07f40b
126 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. The PDF contains numerous embedded URLs, many pointing to disposable hosting services, suggesting a link farm or phishing attempt. The document body, though heavily obfuscated, contains metadata related to 'wkhtmltopdf' and a URL that aligns with the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://cructi.ru/pbw?utm_term=spoken+poetry+tagalog+about+love+and+pain PDF link annotation
    • https://vejuxafesopekub.weebly.com/uploads/1/3/6/0/136010302/zafom.pdfIn PDF document text
    • https://voxuvuru.weebly.com/uploads/1/3/5/3/135390020/21bdd612fdb4b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416665/normal_60b813de624c5.pdfIn PDF document text
    • https://garowenin.weebly.com/uploads/1/3/4/6/134662298/mobadomowus.pdfIn PDF document text
    • https://rosuxemu.weebly.com/uploads/1/3/0/7/130776582/9259838.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373779/normal_60302ee7a3489.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380384/normal_5ff5593d325fc.pdfIn PDF document text
    • https://wobafelu.weebly.com/uploads/1/3/4/6/134613510/8612f45bc0e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384819/normal_602db3bda18fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446638/normal_606c13b2b5b13.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4368952/normal_60aff9a5e0f9c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381988/normal_60174611de713.pdfIn PDF document text
    • https://nokifijipuf.weebly.com/uploads/1/3/4/3/134305843/nolifitaxep.pdfIn PDF document text
    • https://namovanuzo.weebly.com/uploads/1/3/1/6/131606642/tasule-zirizesozor-lixaxotikodi-sikijasasugiga.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444644/normal_605a97361163c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459922/normal_5fe8c24ef0565.pdfIn PDF document text
    • https://forelidik.weebly.com/uploads/1/3/0/7/130775511/nusomiguruba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wevapejatu.pbworks.com/w/file/fetch/144601047/siyah_yaz_yazma_ekilli.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144418773/83143598251.pdfIn PDF document text
    • http://mutatalibo.pbworks.com/f/american_racing_2_unblocked_games_76.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/661ae6f5-9fe8-4159-b623-bc13ca178e8c/implied_terms_in_english_contract_law.pdfIn PDF document text
    • http://gulisapil.pbworks.com/w/file/fetch/144419478/2399264410.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/701d58a4-b0bb-4b22-aafe-f4f89bd75624/luzonepozaniweguwe.pdfIn PDF document text
    • http://nunaruribeg.pbworks.com/w/file/fetch/144418185/motor_kw_to_amps_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01c059f2-86a5-4a11-b31e-3c6659f5e179/tl-wr841n_openwrt_download.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_off00010623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10623 5420 bytes
SHA-256: 144a155f4c334abaafa6075f3d05e8ef1d00836914b1619551b17e9c56114e98
font_01_sfnt_off000118a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118A6 11808 bytes
SHA-256: e5ae1ef283beb5149766df8426189a5d73f4e5b2337b8d0fb084cd71b418218e