Malicious PDF — malware analysis report

Static analysis result for SHA-256 f939ce40671a76f4…

MALICIOUS

PDF

73.5 KB Created: 2021-01-09 11:21:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 3a48ec095acab5b9e79b1ce0d59be80d SHA-1: 93ba483d6ef0276659f48e2c901ebc2c6c25e0d7 SHA-256: f939ce40671a76f44cbd662ee871d82a81ca8f45b89c796485f309ab698766eb
244 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, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate it's a link farm designed to distribute malicious content. While no scripts were extracted, the PDF structure itself is used to host and redirect to external URLs, likely for phishing or malware delivery.

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
  • 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/123?utm_term=dinosaur+caves+park+events In PDF document text
    • https://vukuzimina.weebly.com/uploads/1/3/4/1/134109202/3018686.pdfIn PDF document text
    • https://nirawulef.weebly.com/uploads/1/3/4/3/134324477/355916.pdfIn PDF document text
    • https://gemenudotipetal.weebly.com/uploads/1/3/2/6/132695720/bulamulup.pdfIn PDF document text
    • https://sijevunima.weebly.com/uploads/1/3/1/8/131859613/7322615.pdfIn PDF document text
    • https://cdn.sqhk.co/jowapezo/0CWaUkm/make_my_photo_square_without_cropping.pdfIn PDF document text
    • https://cdn.sqhk.co/bitaxukezor/icjjje2/house_flipping_business_cards.pdfIn PDF document text
    • https://wosabizovores.weebly.com/uploads/1/3/4/5/134577485/sedidoso.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/fedure/negative_fractional_enlargement_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a737254-de04-440b-8d0c-e4208ce39157/zudilonokarav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9b65107e-ac90-42ca-baef-1bfbc28afe5b/fairview_riverside_hospital_detox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f0eadd66-2d44-4428-a50b-73cf37602267/29154147982.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/339b413f-b74d-4197-83ae-fe013a6670c2/poxenipejete.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_off0000e470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE470 5016 bytes
SHA-256: 1d6ba76000ff952c9f9942665b38732ec9333f9c9043769e56dcc27e8d33bc12
font_01_sfnt_off0000f5a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5A3 10440 bytes
SHA-256: 7ac60876c2ceb3b79b0f8d2516c24bdf57ea6f703d82de38e4653abf9b20bfa9

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