Malicious PDF — malware analysis report

Static analysis result for SHA-256 d144d7741174e2aa…

MALICIOUS

PDF

71.5 KB Created: 2020-12-22 15:57:07 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 447730a4e5cbee77e178391a8bf298b0 SHA-1: 7b63e6ea6f63bbdf4bcefdbc14d6f3f4cf28650a SHA-256: d144d7741174e2aa925101d2b33bd2abcefe80f32db740034d29458746f0981b
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of embedded links, many of which point to disposable hosting and redirector services, indicating a link farm designed to distribute traffic. One critical heuristic identified a link to known malicious redirector infrastructure, and ClamAV detected the file as Pdf.Phishing.Trojan. This suggests the document is part of a phishing or malicious redirection scheme, likely delivered as a spearphishing attachment.

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
  • 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.
  • 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://ggtraff.ru/strik?utm_term=digital+marketing+strategy+courses+online In PDF document text
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/8373367.pdfIn PDF document text
    • https://nonexivibofopuv.weebly.com/uploads/1/3/4/6/134603010/bc15cbec5.pdfIn PDF document text
    • https://voxomusixexuso.weebly.com/uploads/1/3/4/8/134851372/450b8b7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453134/normal_5fc7ad078a7a5.pdfIn PDF document text
    • https://wolalusajiri.weebly.com/uploads/1/3/4/6/134600438/godazikuturizaj-napox.pdfIn PDF document text
    • https://zajevikafe.weebly.com/uploads/1/3/5/2/135297545/2390351.pdfIn PDF document text
    • https://sakotitalivuvu.weebly.com/uploads/1/3/4/8/134887700/zofele.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446784/normal_5fa849589dbbe.pdfIn PDF document text
    • https://renobikedasel.weebly.com/uploads/1/3/4/8/134897329/6273975.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/3375703d-31a3-4b2f-b567-62d4dd224248/26926436869.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435759ce-8141-41ed-8609-4a9478e94e8b/30456886290.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdd486d1091525336533171/t/5fddcc027514fb3b7635dedc/1608371206925/platform_ajay_devgan_full_movie_video.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf61d9cb3e0f5771473ad8/1606377946063/89122807250.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce7b639c-76a2-4527-9472-056eadff1698/55651827942.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_off0000dad9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAD9 5284 bytes
SHA-256: 323844de5a4d11dcd388a826e8edbc89980858e54461e37e594103802046ebb4
font_01_sfnt_off0000ecd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECD1 10676 bytes
SHA-256: b437aa9a3b1775069a7f31bd5a98677e07284385d17e408393c4aeac0efb78c7

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