Malicious PDF — malware analysis report

Static analysis result for SHA-256 086ec7ff1ab545a0…

MALICIOUS

PDF

74.8 KB Created: 2021-03-18 03:37:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 25eb55b9f38c7563a688af078e3b5ede SHA-1: f8c33e2405490abc5e61a86ebc003f1332ac8073 SHA-256: 086ec7ff1ab545a094591af1b9fc404a98a1daee2d55faff6dceaaea38234f06
186 Risk Score

Malware Insights

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

This PDF was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan-like behavior. It functions as a link farm, containing numerous external links, many of which point to other PDFs hosted on disposable domains. The primary purpose appears to be SEO manipulation or directing users to potentially malicious content, evidenced by the PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM heuristics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://druttle.ru/wix?keyword=easy+true+stories+pdf+download PDF link annotation
    • http://vannabanyavsedela.xyz/7643155494241mvu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480399/normal_6025b688d74ba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401518/normal_6026d3cb2cccf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454302/normal_6021a5eed1778.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366620/normal_5fdbb63d19173.pdfIn PDF document text
    • http://bumasujofoj.getenjoyment.net/95287919636.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387433/normal_604cfb55547ca.pdfIn PDF document text
    • http://salonvarna.com/23949758044slp1i.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383792/normal_5ffb944b3d98f.pdfIn PDF document text
    • http://chatik85939775.fun/bissell_big_green_deep_cleaning_machine_carpet_cleaner_86t3_kohlshwgsu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4b002d3c-a55f-42ce-816c-238f848e88a9.filesusr.com/ugd/3398cc_bc88142feea348c1848c890826fe229b.pdf?index=trueIn PDF document text
    • https://b3079848-b07e-4d89-9244-05dfa5dd91fe.filesusr.com/ugd/3ab5ed_ad8792b6082d4a058ae40a8dd353e1ab.pdf?index=trueIn PDF document text
    • https://19f621d4-ab03-49b5-bf1d-c78de40104d4.filesusr.com/ugd/bc84a3_19821ce4b20a426280f7f2e37c0fe4f9.pdf?index=trueIn PDF document text
    • https://0c1adbbe-b65a-4c28-9da2-87cea21e0636.filesusr.com/ugd/496951_ea7a330cf72f49648694ea7f2c537295.pdf?index=trueIn PDF document text
    • http://dupepoge.onlinewebshop.net/sunbeam_heated_blanket_microplush_10_heat_settings_garnet_full.pdfIn PDF document text
    • http://nakarajibap.myartsonline.com/50856542695.pdfIn PDF document text
    • https://bdc3fad0-85dd-4e34-85f7-620d54d4ff6f.filesusr.com/ugd/10cedf_14666ca8e56d42a7bbe3e07d48fb2d37.pdf?index=trueIn PDF document text
    • https://e3c65705-3664-417e-97b1-2ac29bfab8bd.filesusr.com/ugd/6a5da5_bc13445d400d43c79fd0dbf5bf5bf731.pdf?index=trueIn PDF document text
    • http://bumejefivoxigo.myartsonline.com/wire_gauge_amperage_chart.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_off0000e624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE624 5184 bytes
SHA-256: 4a746800301c6e6c67e832e0dfe5f5231c702a44800d3e27635cff014aef4109
font_01_sfnt_off0000f7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F5 11288 bytes
SHA-256: c36021609043df3f453fa0841ebb18b43b46786a668b62c17ecdd555f0cec798

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