Malicious PDF — malware analysis report

Static analysis result for SHA-256 d78856793f4250b5…

MALICIOUS

PDF

65.9 KB Created: 2020-12-20 14:49:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 6394f3e60746c66986d2a6f021fa8127 SHA-1: 1eaac62e22fe060c565e69a792327ec289cc7a76 SHA-256: d78856793f4250b5b57376e0f688ba7b87ccf8b44652f8f72b5f87c26e2a7ed8
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious by multiple heuristics and a machine learning classifier, including critical alerts for malicious redirector links and a link farm on disposable hosting. The embedded links, such as 'https://traffine.ru/strik?utm_term=fuzzy+lookup+excel+manual', are designed to redirect users to potentially harmful content. The document's structure and numerous external links suggest a phishing or malware distribution attempt, likely using a social engineering pretext related to Excel manuals.

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://traffine.ru/strik?utm_term=fuzzy+lookup+excel+manual In PDF document text
    • https://daletutanedura.weebly.com/uploads/1/3/1/6/131636587/junibived.pdfIn PDF document text
    • https://kunimagim.weebly.com/uploads/1/3/4/6/134608209/9935ec.pdfIn PDF document text
    • https://molisemopum.weebly.com/uploads/1/3/1/4/131437834/xizejenevana-kirunavi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366959/normal_5f935174be1a8.pdfIn PDF document text
    • https://xazulifego.weebly.com/uploads/1/3/4/7/134727283/7304008.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412775/normal_5fb31be78438f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369164/normal_5f91488e5ed06.pdfIn PDF document text
    • https://sefenavimeta.weebly.com/uploads/1/3/4/8/134885596/kobexefikutov_sedepido.pdfIn PDF document text
    • https://voxapinave.weebly.com/uploads/1/3/2/7/132740917/6232809.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/358149e2-e80e-4d61-8e84-0c9ec346812d/computer_networking_a_top-down_approach_7th_edition_solutions_github.pdfIn PDF document text
    • https://s3.amazonaws.com/mitakajazum/watch_wrestling_com.pdfIn PDF document text
    • https://s3.amazonaws.com/wovigebi/mepinekuboniforizalagewo.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_off0000c5e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5E3 5044 bytes
SHA-256: 184b549aaee633555374a7869d6f42aab9a16a32cecd41742c6a5c186041c7da
font_01_sfnt_off0000d719.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD719 10500 bytes
SHA-256: 30bdefaa5e51193150d1008159a47c54d9645b1f49cd6e9f2b1b5c92e2a3e58d

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