Malicious PDF — malware analysis report

Static analysis result for SHA-256 63dc3dc26352a51f…

MALICIOUS

PDF

66.0 KB Created: 2021-02-16 14:15:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 1e5cddb286b420e1a9f3fb88dd058eda SHA-1: a78277444f4f7df8785a820e901338355ef3146d SHA-256: 63dc3dc26352a51fd84fc845535f3e76f31bc01375e052bef85147a089a99ced
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a common tactic for SEO manipulation or to distribute malicious content. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and link farm nature suggest it's designed to redirect users to potentially harmful sites, possibly involving phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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://druttle.ru/wb?keyword=mm%20pulgadas%20tabla PDF link annotation
    • https://sexaximelukifa.weebly.com/uploads/1/3/1/0/131069869/41f38.pdfIn PDF document text
    • https://cdn.sqhk.co/birofinud/jgciehd/wedenatoxisubidagu.pdfIn PDF document text
    • http://zuviferufudufa.iblogger.org/sinavunofanazemi.pdfIn PDF document text
    • http://usmileofficial.site/81233868600mf7ju.pdfIn PDF document text
    • https://cdn.sqhk.co/nejibija/diiwMih/84804042227.pdfIn PDF document text
    • http://webmastervlad.ru/all_the_bright_placesnwk1l.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/ggeLgdL/93747853138.pdfIn PDF document text
    • http://keligekixebar.22web.org/ziparenajitiwol.pdfIn PDF document text
    • http://domastmsk.space/kendo_grid_popup_editor_template_mvc_validation0qew4.pdfIn PDF document text
    • https://cdn.sqhk.co/poronujefino/djehgge/17350426421.pdfIn PDF document text
    • http://teksol.xyz/17364650073qwkvn.pdfIn PDF document text
    • https://cdn.sqhk.co/wizevomorofe/wiehdwe/survivor_island_of_the_idols_cast_voted_off.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jopiwutipav.epizy.com/excel_freeze_top_row_on_all_sheets.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_off0000c578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC578 5328 bytes
SHA-256: 5571381b59871f1bebd2da6a5d16a8f5a80182142f5c6b09005a4a6ecbf7e3e3
font_01_sfnt_off0000d789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD789 10612 bytes
SHA-256: c14ee7650dbd7d2fa10ef24a78dc942045c21163db2cc99354cb375507cc63ab

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