Malicious PDF — malware analysis report

Static analysis result for SHA-256 ee8f86d26634173b…

MALICIOUS

PDF

84.7 KB Created: 2021-03-06 13:39:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a15485179f5d440ba29eb8bd7679f8ab SHA-1: 5e7b762ffdb15197532b5863eca0768987b326a4 SHA-256: ee8f86d26634173b2014c457c20e2b2029a14c69a027ba24cd0d4c730f8b04ec
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with heuristics indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or SEO abuse. While no scripts were directly extracted, the PDF structure and embedded URLs point towards an attempt to redirect users to potentially harmful or deceptive websites.

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://nipisod.ru/123?utm_term=dr+seuss+how+the+grinch+stole+christmas+movie+clips PDF link annotation
    • http://snegny.com/how_to_check_a_new_apartment_for_bed_bugs7exaj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484093/normal_603917fc7edf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_603e65a9906d1.pdfIn PDF document text
    • http://shtampshop.ru/why_is_dyson_v6_not_charging077vn.pdfIn PDF document text
    • http://jadebey-x.com/xedujobasaxugilabedejawuv7ky6.pdfIn PDF document text
    • http://fuzubijixulux.mygamesonline.org/41986960647.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465393/normal_600c88061cec6.pdfIn PDF document text
    • http://trokot-newshop.online/davefoziwupve8f5.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/86074466-856a-4532-9821-d7f70f7b16fa/39630526594.pdfIn PDF document text
    • https://98350ace-7ac4-4f38-a9d9-579fdad8050b.filesusr.com/ugd/9b2d9b_a201f8bdb2d14e688ccd4e598f178778.pdf?index=trueIn PDF document text
    • https://87da31d5-d184-45e7-a456-0ad082c8bd65.filesusr.com/ugd/55e94a_fdb74375456541b2ab7c606d87ec65bf.pdf?index=trueIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_86cbd3cab030488988f2b60bd3855633.pdf?index=trueIn PDF document text
    • https://72a23b54-95c1-47c0-80d6-f7b1310faeb8.filesusr.com/ugd/65b209_8cf77fa173ba449db425afb672183e69.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7084b8a-a0bf-49f8-85cc-cc38c218d8ac/what_does_a_support_specialist_do.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f778255-882e-48d0-8c5b-5a4794f97c76/lolegoxebodixizagasusepis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/826bc84b-fffc-48d6-b21b-7cfd8ae84877/36692573933.pdfIn PDF document text
    • https://33fe1336-4051-433c-b691-b763732126dd.filesusr.com/ugd/6c8f37_444712b13b584013a807049c286c9e7e.pdf?index=trueIn PDF document text
    • https://89e5ed4a-33eb-42a6-b5f1-9fc07ea1e15b.filesusr.com/ugd/ff68bb_d3f14ebc3d374c41be60613a80d8b952.pdf?index=trueIn PDF document text
    • http://petojijoxura.onlinewebshop.net/fobuxasisidesemi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40c8c6c6-025c-4a51-93de-b5ae623531db/resumen_libro_para_leer_el_pato_donald.pdfIn PDF document text
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_36c128f0fe504408955b8beab4b3ccce.pdf?index=trueIn 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_off00010c2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C2B 5496 bytes
SHA-256: ba4378e053299dbd7b7947fa2d682dfccd8f7c03a6290fab41eea04367c87c1a
font_01_sfnt_off00011edb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11EDB 11360 bytes
SHA-256: fcc0e3867dc6ea846986a13251f0ec5672f6be34b9420c6f3003025a0d07d01b