Malicious PDF — malware analysis report

Static analysis result for SHA-256 26d003c452747d77…

MALICIOUS

PDF

76.8 KB Created: 2021-04-12 13:53:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: bb8c726af7766cd6705f610ed817203d SHA-1: 7cad394d50c00053ab0d4cbf0c1312b5bcd4fca7 SHA-256: 26d003c452747d77e4c3ff6b4e77dbe3685932dd5fc22493c24a3b9effe76cf2
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. The document contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO spam operation. The embedded URLs, such as 'https://zajinet.ru/strik?utm_term=what+is+ethical+hacking+in+telugu', are likely used to redirect users to malicious content or phishing sites. No scripts were extracted, but the PDF structure itself is designed to facilitate traffic to these external resources.

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://zajinet.ru/strik?utm_term=what+is+ethical+hacking+in+telugu PDF link annotation
    • https://soranetibipuve.weebly.com/uploads/1/3/0/7/130738631/451238.pdfIn PDF document text
    • https://cdn.sqhk.co/suvotoruwot/bOPHsja/z_nation_cast_lucy_season_4.pdfIn PDF document text
    • https://cdn.sqhk.co/rozesivotix/a5jgdhd/communism_vs_capitalism_vs_socialism_vs_fascism.pdfIn PDF document text
    • https://berapiginufar.weebly.com/uploads/1/3/4/3/134316450/3b251dda8f1.pdfIn PDF document text
    • https://fababeporutow.weebly.com/uploads/1/3/1/3/131381804/wumif.pdfIn PDF document text
    • http://aduo5.online/creative_company_profile_templateqhaye.pdfIn PDF document text
    • https://cdn.sqhk.co/wesaduleb/uifjdi8/89070064233.pdfIn PDF document text
    • https://cdn.sqhk.co/puvijupem/ZDgejgi/top_secret_apps_for_android.pdfIn PDF document text
    • https://cdn.sqhk.co/wibetaxor/bFyjhjc/shoot_bottle_new_gun_games.pdfIn PDF document text
    • https://cdn.sqhk.co/laxiroroweno/qfidRgc/baribafofefowofukikebakuw.pdfIn PDF document text
    • http://gufutaca5.xyz/cdf_vs_weibullgqfmp.pdfIn PDF document text
    • https://cdn.sqhk.co/budatumibowu/5igHVa0/wallpaper_hd_images_2020_apple_fruit.pdfIn PDF document text
    • https://cdn.sqhk.co/tibidimewako/bbfnKfk/57290013446.pdfIn PDF document text
    • https://cdn.sqhk.co/sanozusu/icyFigr/pathogenicity_meaning_in_english.pdfIn PDF document text
    • https://cdn.sqhk.co/rufebumu/aiajeT9/perfect_shift_staffing.pdfIn PDF document text
    • http://trikolor.site/guitar_arpeggios_exerciseso6vle.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377102/normal_6041bbe056a54.pdfIn PDF document text
    • http://usacreditcheck.info/tenant_routine_inspection_report_form_285w159.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379220/normal_5fdc17580b5e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423136/normal_60150d6244ab0.pdfIn PDF document text
    • https://subokolabipu.weebly.com/uploads/1/3/2/3/132303028/4427395.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375525/normal_6064169520586.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://af431a04-9ebc-4ea4-a98d-45e4ffbfad14.filesusr.com/ugd/485053_700a8ce5b4084bc3a4c9eef872d4c223.pdf?index=trueIn PDF document text
    • https://ec451167-49e0-489e-a150-d7dc0ecf9264.filesusr.com/ugd/fe0276_ee8de4061c2949e3af01466e94b44992.pdf?index=trueIn PDF document text
    • https://ae26bae5-b1f3-4fb2-a0ba-5d2f2d23988c.filesusr.com/ugd/aec2ea_92ed8563f6a64f8f9d26812892e6cedc.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_off0000eddf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDF 5040 bytes
SHA-256: 1ea5c5e43bc2de409c7bb3674dc354ecd9c45908483f400fa4c5c87deafed87d
font_01_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 11376 bytes
SHA-256: 6b3bca1f697ed4d6c14344a1aabbdd339a4f8c9dbb9bd52b9cafb132dcbd1d90

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