Malicious PDF — malware analysis report

Static analysis result for SHA-256 c82f2280e01e92f6…

MALICIOUS

PDF

84.2 KB Created: 2021-05-31 12:05:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 0e4bfe2a257e964e5504ad90aa6669c7 SHA-1: 58b1d685cf5e16f8bccf5e8ebaf51d5845bc007f SHA-256: c82f2280e01e92f658f3493b620edae3e655eb6e979baf101fbfb0b999537f64
186 Risk Score

Malware Insights

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

The sample is a PDF document identified as malicious by ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. One prominent URL is https://resalured.ru/strik?utm_term=telenovela+a+escrava+isaura+em+espanhol, which likely serves as a lure. The PDF structure and embedded links indicate an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://resalured.ru/strik?utm_term=telenovela+a+escrava+isaura+em+espanhol PDF link annotation
    • https://zefisuket.weebly.com/uploads/1/3/4/8/134868467/pevexilaw_wemupenipu_lixaxagumepe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393358/normal_5fdda19cafc35.pdfIn PDF document text
    • https://debivozujorebol.weebly.com/uploads/1/3/0/8/130813616/zatetinuxuxir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4527357/normal_5fca7bcdcda81.pdfIn PDF document text
    • https://naxazutip.weebly.com/uploads/1/3/4/6/134610322/vakapomupisaned.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462339/normal_5fea1a2dcf1ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461484/normal_6013ece354e59.pdfIn PDF document text
    • https://zogazakuf.weebly.com/uploads/1/3/1/6/131636678/7364330.pdfIn PDF document text
    • https://wetenonuvodipu.weebly.com/uploads/1/3/5/3/135321676/06b75.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448746/normal_601a4467139fc.pdfIn PDF document text
    • https://febadezupuwile.weebly.com/uploads/1/3/1/0/131071278/linexikazowiraxanez.pdfIn PDF document text
    • https://mamunazeve.weebly.com/uploads/1/3/0/8/130814121/f7406be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388422/normal_603506309c029.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491152/normal_601a9b1e8166f.pdfIn PDF document text
    • https://juvudunepuzuvo.weebly.com/uploads/1/3/4/5/134513453/b9ad73c41534.pdfIn PDF document text
    • https://powigakiluxoja.weebly.com/uploads/1/3/4/5/134521341/566611598.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418781/normal_606637bd21663.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474218/normal_5fea068d5e7a2.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/0f6bb16f-ec3d-4459-8883-2d1358a6f8b0/wapojiwujujek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1a653980-8aeb-4abe-8e11-c3cdb999924b/nican_mopohua_nahuatl_y_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/037aad54-ee4e-4f5f-b1e8-5ddb4d9a1810/tifuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/481306bc-7160-43d0-9db1-581dde0b9cb0/45672415643.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/798d8475-a0c8-431d-af65-e106a5860065/buckminster_fuller_synergetics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc0e0d26-c9a2-41f7-9cfa-41d7eb259d03/woods_timer_instructions_50013.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0c1656ce-525a-426d-a5a0-4aa65f118a70/sekarabodojiwitebof.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_off0001081b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1081B 5180 bytes
SHA-256: 831d58006484493aa2d4c8c312540f67fba086a2a87bda93faf07df8682e7250
font_01_sfnt_off00011995.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11995 13728 bytes
SHA-256: ace4980aa8fe60cc397794c41e9a54b613e65d32e261133e278cb091c72f6525

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