Malicious PDF — malware analysis report

Static analysis result for SHA-256 12bcbe7547f1d222…

MALICIOUS

PDF

86.5 KB Created: 2021-02-04 15:47:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 458b4a8b9d47dcc3b3177d21c1a08f2c SHA-1: eab07f004c9acbd90d02dd227af1cb0bc08e4347 SHA-256: 12bcbe7547f1d2220344409578ffe8614ee865928384f3ef61623fac81b18d0c
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm or SEO spam operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially malicious content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://crophysi.ru/123?utm_term=types+of+kites+in+pakistan PDF link annotation
    • https://guvolobojifo.weebly.com/uploads/1/3/4/7/134733869/d1f9670e59d0c4.pdfIn PDF document text
    • https://dubitofux.weebly.com/uploads/1/3/4/4/134458445/fiwer.pdfIn PDF document text
    • https://cdn.sqhk.co/gedodupem/cijhgIj/tobijizilopokatokex.pdfIn PDF document text
    • https://zisediri.weebly.com/uploads/1/3/1/4/131411341/fekunewo-paripiragukol-bakaragujo-likulodur.pdfIn PDF document text
    • https://cdn.sqhk.co/leluforeref/fjijgia/79934357020.pdfIn PDF document text
    • https://cdn.sqhk.co/kolokejo/ieFgjij/bokemitixezuwowudekule.pdfIn PDF document text
    • https://denalozi.weebly.com/uploads/1/3/0/7/130776502/97e85060e41b56.pdfIn PDF document text
    • https://vakenufepuxino.weebly.com/uploads/1/3/4/5/134529081/gizuderevabo.pdfIn PDF document text
    • https://wonakusoxenim.weebly.com/uploads/1/3/5/3/135340368/tisob_doxuzapexu_xuvitera_denegewis.pdfIn PDF document text
    • https://toredakiwireg.weebly.com/uploads/1/3/0/7/130739366/voxixisusiwubilix.pdfIn PDF document text
    • https://modizotu.weebly.com/uploads/1/3/2/7/132740501/relodekozik.pdfIn PDF document text
    • https://bokosemebejira.weebly.com/uploads/1/3/0/8/130813317/sunefufipip.pdfIn PDF document text
    • https://cdn.sqhk.co/josurowelimu/fA4kVih/twitter_dm_video_downloader_chrome.pdfIn PDF document text
    • https://rigawolazi.weebly.com/uploads/1/3/4/7/134710531/zedetadebobuluw-rizumusire.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekife/conceptual_physics_textbook_chapter_2_answers.pdfIn PDF document text
    • http://masesererevitug.epizy.com/sad_and_love_whatsapp_status_video.pdfIn PDF document text
    • http://vilusosexar.epizy.com/36673753865.pdfIn PDF document text
    • https://s3.amazonaws.com/tarizirefevifab/google_assistant_api_android_example.pdfIn PDF document text
    • http://januxalak.rf.gd/best_rom_site_2018.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_off00011623.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11623 4884 bytes
SHA-256: a868d1d7590af9bb89f51b912d13603830ed38cae7daab67000932872dffc0fa
font_01_sfnt_off000126e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126E7 11268 bytes
SHA-256: 9a05f13504267ed7a2c81751767b08a4582d442b45c26491cc26e072584acae3

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