Malicious PDF — malware analysis report

Static analysis result for SHA-256 595ab8a533c37693…

MALICIOUS

PDF

84.7 KB Created: 2020-11-28 10:06:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: eee5f59abd182b23598600ade1454498 SHA-1: 2bc8cff0c176eb522ed518a21abc1e96baf7a443 SHA-256: 595ab8a533c3769356c127d5008d4e41256298bca11e0e4b94a4f0f52f34ca3e
252 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file contains a large number of embedded links, many of which point to disposable hosting or known malicious redirectors. The primary function appears to be acting as a link farm to distribute traffic to potentially malicious content, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. While no scripts were directly extracted, the nature of the embedded links suggests a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffmen.ru/123?utm_term=true+metrix+meter+manual In PDF document text
    • https://cdn-cms.f-static.net/uploads/4417221/normal_5fb9eb7b66072.pdfIn PDF document text
    • https://kubupukadumu.weebly.com/uploads/1/3/1/3/131382740/7f8694e061bfd50.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464730/normal_5faf72b7db6df.pdfIn PDF document text
    • https://jekunido.weebly.com/uploads/1/3/4/3/134312583/sapusuniruje-xoradari.pdfIn PDF document text
    • https://dubarepexax.weebly.com/uploads/1/3/4/5/134586846/9491594.pdfIn PDF document text
    • https://dumetokewip.weebly.com/uploads/1/3/4/3/134394823/52bc0d4f481ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410731/normal_5f9d25ef76895.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369174/normal_5f8a2cc3834dc.pdfIn PDF document text
    • https://xemaxokiba.weebly.com/uploads/1/3/4/3/134350412/miline.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/xapidajovaji/inspiron_one_2020_memory.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0912876-734b-453c-8716-505c2798d7d3/pdx_airport_arrivals_and_departures.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/918a19f2-ca29-46b8-8fab-63b287f47096/fluidesign_1x_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/sezutuma/zaloxuvevugefunofi.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_off00011098.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11098 4668 bytes
SHA-256: c15e638fb6a85501b65dd0303ccf7b80a20e16c0926860caf5381236033918b4
font_01_sfnt_off0001205c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1205C 11248 bytes
SHA-256: 8ed1fb950f0ac514b29de2adaf34b743a691727a4cc3fb1c36348c9ab3036ada

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