Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c5fd5d3dfec52bf…

MALICIOUS

PDF

81.3 KB Created: 2021-06-05 08:21:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 157a2b8773b7b28db86ab5de6dacb744 SHA-1: e27d530e31bd435df6fa1c3a76141974a592789e SHA-256: 2c5fd5d3dfec52bfec27b41e2dbc7517d14dbde146c2ce11c4d385644ee03de6
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains text related to an English textbook, which is likely a lure to disguise the malicious nature of the links. No scripts were extracted, but the presence of numerous external links is a strong indicator of a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://ketchas.ru/pbw?utm_term=libro+de+ingles+de+telesecundaria+tercer+grado+pdf+traducido PDF link annotation
    • https://nirefuriwubava.weebly.com/uploads/1/3/1/6/131637308/zosemutot-jevawales.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470683/normal_5fcb0a3acdb24.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457861/normal_5fde5c5d64e6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370088/normal_605996ebcd1dd.pdfIn PDF document text
    • https://mumerigowijegap.weebly.com/uploads/1/3/4/7/134771458/funiliw_buneparis_wazeso_turib.pdfIn PDF document text
    • https://nafeziwubiwodi.weebly.com/uploads/1/3/1/3/131379183/wulikuweroza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424996/normal_603424cca8ee9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411714/normal_5fdb98bd29057.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4416811/normal_60b68d6e46e15.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426960/normal_5ff169d11ae38.pdfIn PDF document text
    • https://firebawoba.weebly.com/uploads/1/3/4/6/134659507/keveru.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423462/normal_60523715720fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384821/normal_6069edbb9b042.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479435/normal_60599e4709d77.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387243/normal_5ffcc7e17b959.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467285/normal_600e70ad6ce7c.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/a0eaea52-d65b-4d71-9740-d104955a2f8f/acura_integra_maintenance_schedule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8046c6c3-24a8-42e5-8321-fb633fec7a94/52754529564.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba953bcf-a00c-4d1e-a515-84b41671c678/97343179288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c07aab6-c537-470d-bba7-99b8484cec3b/how_to_unlock_iphone_5_activation_lock.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/907da716-bd43-4e80-8863-b07fbf86585f/putulezukopujasilanu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b46ee0-86af-4df3-abf3-db65568ba1d9/fuxon.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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e37e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE37E 5284 bytes
SHA-256: bb11ffbeafdf212bfd852c24c93525fb81601f5d329828eb1aeb50739d329f40
font_01_sfnt_off0000f578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF578 2448 bytes
SHA-256: b86bde638b9e107d32b1196ecf0d8ea41822326c58773264b91f79d1ede816ea
font_02_sfnt_off0000ff2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2A 12148 bytes
SHA-256: 1ee97c83da677397a77d9a71cc2ef17ab62c8fed7bba2f53c3fac2f65c32cafc
font_03_sfnt_off00012676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12676 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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