Malicious PDF — malware analysis report

Static analysis result for SHA-256 00197d6a16b68f71…

MALICIOUS

PDF

78.1 KB Created: 2021-05-24 23:36:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: cf16b8faea95dbacb3af510ec02bf4a5 SHA-1: b36d7c0ed4a1a19642a980cc4750475ce79957e2 SHA-256: 00197d6a16b68f71364aa7f11cb1d3dbb4263d69ea5f2de6c0742ccba420f82e
186 Risk Score

Malware Insights

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

This PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or spam distribution tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing. While no scripts were explicitly extracted, the PDF structure and numerous external URIs point towards a mechanism for redirecting users to potentially malicious sites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://golowaki.ru/strik?utm_term=how+to+reduce+scarring+after+rhinoplasty PDF link annotation
    • https://remogomati.weebly.com/uploads/1/3/4/7/134748537/tugun_rolid.pdfIn PDF document text
    • https://tiguxenejizowi.weebly.com/uploads/1/3/4/8/134899735/2718851.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451549/normal_5fcf073140d9e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481417/normal_600ccfbfba9d5.pdfIn PDF document text
    • https://nafoxowozuvika.weebly.com/uploads/1/3/1/3/131383754/3a16c9ce865c4d.pdfIn PDF document text
    • https://zewijevatijafat.weebly.com/uploads/1/3/4/2/134265582/vekaxawevikifez.pdfIn PDF document text
    • https://kutowovazamil.weebly.com/uploads/1/3/4/3/134362820/rujarolugenufoj_bosavol_kuruvagazaxe_xezuxojumuf.pdfIn PDF document text
    • https://biwoxigaluna.weebly.com/uploads/1/3/2/6/132681579/2203321.pdfIn PDF document text
    • https://wezusutuxalik.weebly.com/uploads/1/3/1/6/131637092/8680550.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467910/normal_6044f65da77a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464739/normal_604797303d324.pdfIn PDF document text
    • https://kevonixoxudunu.weebly.com/uploads/1/3/0/7/130775897/wawafafuwazof.pdfIn PDF document text
    • https://nofabirudop.weebly.com/uploads/1/3/4/4/134455392/a5af4b57.pdfIn PDF document text
    • https://tajaleder.weebly.com/uploads/1/3/5/3/135320318/sejalun.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/f571c69c-31b4-4c9a-8092-938816b4a463/duraflame_20-in_infrared_3d_electric_fireplace_log_set_-_dfi055.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c8d5457-a9ce-44d0-acbf-5cb848aedb4a/73763627197.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa248fa4-e06d-4000-8335-ffed67fd2395/24881044384.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/840eb965-7e8e-4781-b0f8-ec0a8f71d7ec/jafobezebafujosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/41d77198-6c22-4910-a453-e3219aa51d11/susigeredu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c1393585-d724-43e4-a7a2-192ae4c77ee0/vietnam_war_primary_source_analysis_worksheet_answers.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_off0000f162.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF162 5572 bytes
SHA-256: 0e0a94493ce3aaf82804222498c11ba0ffed6792d799de3e6aa6d57262fad534
font_01_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 10848 bytes
SHA-256: d0c7fa467fd0e4c63e1c71a6627614d3cc58a96e603d9ce96ad04d9e03667f73