Malicious PDF — malware analysis report

Static analysis result for SHA-256 bcb731425a4ceea1…

MALICIOUS

PDF

80.4 KB Created: 2021-05-20 09:12:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 16aa1c9e9b46018ba213bc4ca28a9fc9 SHA-1: ce58a2f848e3cce54eb7df877270ea3961fd5e43 SHA-256: bcb731425a4ceea1de90d13b171cacf2abfcd5f3dc0b38a77a67964989c09d45
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The primary IOC is the initial URL which contains a UTM term, suggesting a tracking or campaign-related purpose.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://fokemale.ru/strik?utm_term=que+es+el+sistema+endocrino+y+como+funciona PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4407989/normal_5fedadfbc256c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495254/normal_602547855c7c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369333/normal_5fdc16e4a059b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427538/normal_600c135ff4236.pdfIn PDF document text
    • https://pizewenijanud.weebly.com/uploads/1/3/0/7/130775868/8008592010.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386618/normal_603c108fe611d.pdfIn PDF document text
    • https://fofomobagukewe.weebly.com/uploads/1/3/4/3/134352826/18408ebc2b13429.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389606/normal_603ce97dccea4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446399/normal_6025cea04f241.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fc799b50b482.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446379/normal_6034cb9e7939c.pdfIn PDF document text
    • https://kagilomit.weebly.com/uploads/1/3/4/6/134669997/nusoz.pdfIn PDF document text
    • https://lulegosepo.weebly.com/uploads/1/3/0/9/130969478/4436450.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370560/normal_5fe422525323f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454543/normal_603951b7c47e7.pdfIn PDF document text
    • https://levalezekavazif.weebly.com/uploads/1/3/4/6/134639406/8910796.pdfIn PDF document text
    • https://didegesub.weebly.com/uploads/1/3/2/6/132681352/fanozaradatulefus.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385012/normal_604b80f546453.pdfIn PDF document text
    • https://vimadefivikimaw.weebly.com/uploads/1/3/4/2/134265378/mezovitavalaj_nokozamo_wotalugogulazo_dosamokuvagi.pdfIn PDF document text
    • https://bodonovovo.weebly.com/uploads/1/3/1/6/131607174/fevavopazagovir-dudera-dimibarudazi-guvara.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379987/normal_6040547368b7a.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/8a9b3719-268b-4fda-90ec-8e69b9f04cb1/power_plant_problems_in_india_map.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/74912c7c-b3d6-4d7e-829e-55e70709e2b0/have_no_time_for_me_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffd9aa30-9154-4106-ae70-011b8923a315/9318521214.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/267d6ead-7019-4877-a04c-788379266ff2/is_the_book_of_jasher_true.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbac5ad7-65cd-4192-a62b-029490294e4d/vofavijofewuvajefonupa.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_off0000f97b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF97B 5328 bytes
SHA-256: 636dec6a7a973f321041f87adc2b0a4224ab978521cef53601b59101d54e393b
font_01_sfnt_off00010b89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B89 11944 bytes
SHA-256: 109ebe25114c850cd8310be55c8668e87073fbe84765fe697ca86ba1047f4dc9

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