Malicious PDF — malware analysis report

Static analysis result for SHA-256 52875eb60a10f3f7…

MALICIOUS

PDF

76.8 KB Created: 2021-03-25 15:35:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: e5f0d802879c8f29ecf950fe660b1f9d SHA-1: 426c1ea07058dbae78a87d0691944f531fd225e2 SHA-256: 52875eb60a10f3f79a515cd6f7936d5590f32c2ffbddd1ba582f453288498f24
186 Risk Score

Malware Insights

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

This PDF sample was flagged by multiple heuristics as a link farm, containing numerous external URLs pointing to other PDFs. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://dugedepap.ru/strik?utm_term=how+data+mining+is+used+in+healthcare PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4467950/normal_5fc6504660a86.pdfIn PDF document text
    • https://cdn.sqhk.co/wanazofemuvu/iPigLhi/marshmello_helmet_plastic.pdfIn PDF document text
    • https://cdn.sqhk.co/jemitaso/asigJXc/xajififukimaxeza.pdfIn PDF document text
    • https://cdn.sqhk.co/xetorexevapi/KgYjjic/ziwonatibopu.pdfIn PDF document text
    • https://cdn.sqhk.co/wukufazujuv/ogN6Cia/56300752295.pdfIn PDF document text
    • https://cdn.sqhk.co/lepavenujal/poXpfih/dining_room_chairs_set_of_4_brown.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdfIn PDF document text
    • https://cdn.sqhk.co/sadinuko/ij2X7hf/air_soccer_ballon.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_6013ed4ccc4cf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ececae0b-1312-4a4c-959a-117928b3d478.filesusr.com/ugd/e6721e_f53a5ea5672f430a94d8b6b02e2bacbb.pdf?index=trueIn PDF document text
    • https://12c48f50-3553-44c7-a31c-19fc5df83d07.filesusr.com/ugd/7e0eb0_81d9247d06ed4e489836c42c63b0ee9b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bulozor/book_thief_movie_free_download.pdfIn PDF document text
    • https://s3.amazonaws.com/feborobegibew/fincen_suspicious_activity_report_electronic_filing_instructions.pdfIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_ead8750b4b0d4d709fca1098abd9780e.pdf?index=trueIn PDF document text
    • https://dd7ee03d-3646-4e01-a1e1-4c0a7e2c9e57.filesusr.com/ugd/d7ba0f_63ffdf4fe0de45edab710ef486558ae8.pdf?index=trueIn PDF document text
    • http://xomufulikade.epizy.com/autocad_plant_3d_2020_for_designers.pdfIn PDF document text
    • https://s3.amazonaws.com/jejulurowev/91672891528.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/jepinamopejovofulovotima.pdfIn PDF document text
    • https://d046670e-94b8-4ea2-8efc-69fca9b502c9.filesusr.com/ugd/c0b427_e9175e56a12940c395cd124df860c812.pdf?index=trueIn PDF document text
    • http://vujujejinegu.rf.gd/98543599264.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/c_language_programs_questions_and_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_off0000ee19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE19 5408 bytes
SHA-256: 08ad8799feb6cc940a5e4d16434d5da9873ecda972b331274f209bb2906c3d2a
font_01_sfnt_off0001005f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1005F 10948 bytes
SHA-256: b8f338f8a2cf6cf4d562f78facb3957ec26d35c5dfacb91c0c98a0d9a93110d0