Malicious PDF — malware analysis report

Static analysis result for SHA-256 00b9990017a949cf…

MALICIOUS

PDF

89.0 KB Created: 2021-05-26 19:59:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 625166ffc4bc2edf85ffabe4a8e85792 SHA-1: 238298863134a77b645edc078a339fffb17fdb49 SHA-256: 00b9990017a949cffac9e853080346597d5bb8774c94b9c801945b54e21f356b
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to direct users to malicious content. The primary malicious URL identified is 'https://gimoguvi.ru/strik?utm_term=saz+akort+ayar%25C4%25B1+program%25C4%25B1'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://gimoguvi.ru/strik?utm_term=saz+akort+ayar%25C4%25B1+program%25C4%25B1 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4484115/normal_60255879e553b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448540/normal_5ff61ca3d8b09.pdfIn PDF document text
    • https://gedorizifoxe.weebly.com/uploads/1/3/1/6/131607240/janozarojud.pdfIn PDF document text
    • https://fiduludebiwoki.weebly.com/uploads/1/3/4/3/134317875/dumelefofuzunev-semenimom.pdfIn PDF document text
    • https://jabuvevakeg.weebly.com/uploads/1/3/4/6/134685488/a9c18aad1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_6015c0c7283cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447278/normal_5fdbbf30a8eca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454562/normal_6046462c7bee4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367905/normal_6043b99409f4d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370264/normal_5fd660178ac3d.pdfIn PDF document text
    • https://totijavefukaja.weebly.com/uploads/1/3/4/7/134705726/xivewu_vokuvoge_tuwefagaroneki.pdfIn PDF document text
    • https://kepigepejabuji.weebly.com/uploads/1/3/4/3/134315220/d3aa24c02e55.pdfIn PDF document text
    • https://modemogip.weebly.com/uploads/1/3/0/7/130776314/diletuxiwet.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386363/normal_5fcff43671a82.pdfIn PDF document text
    • https://dugesadodi.weebly.com/uploads/1/3/1/1/131164249/93b72.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372960/normal_5fde7bccd5010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425255/normal_60155aad30fbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369671/normal_5ff56517100df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/e76f08d2-064f-4b8a-bfa4-f33ef293fbe9/2002_honda_civic_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8976ff86-c96f-4afa-b994-f38efcbc881d/xonuvudomi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55a160d5-c68e-4ef3-918d-f7ddfc3c6f0d/bose_acoustimass_10_series_iii_installation_instructions.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f96e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF96E 4796 bytes
SHA-256: ccd8de33416bedbd41ec2596bea5292105d16aec39640d1891e9628445cabaf5
font_01_sfnt_off000109cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x109CD 12652 bytes
SHA-256: 589a2c1157614ce7b1805a21fcffe8abf486c4bf2af0e9cd831a26bddaa756ff
font_02_sfnt_off0001313d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1313D 16120 bytes
SHA-256: fb7b45e24c28c4473d0ca1c6410c593992d9a809009f9c41b5ae32c9142507dd
font_03_sfnt_off00014625.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14625 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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