Malicious PDF — malware analysis report

Static analysis result for SHA-256 a4c6beabdbf109c6…

MALICIOUS

PDF

68.9 KB Created: 2021-02-24 21:24:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 2791d028aab31f78b4ce6e9980a8c41d SHA-1: a8c5f94ee2b4a2c762f7241f95d4699bfa949460 SHA-256: a4c6beabdbf109c67f27f9c6a18b16891c5dde5a53e2fc633f906b0f4742f56a
244 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are flagged as malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. The embedded URLs are designed to lure users to potentially harmful sites, likely for phishing or to download further malware.

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://crophysi.ru/wb?keyword=how%20to%20analyze%20data%20in%20research%20paper In PDF document text
    • https://cdn.sqhk.co/pesasotiro/YmTDBgf/futolivuxij.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/VRR2J5F/wafepeli.pdfIn PDF document text
    • http://songkfrk.site/gilan0vtey.pdfIn PDF document text
    • http://free-at.pro/42883254009abbe6.pdfIn PDF document text
    • https://poxatekegevu.weebly.com/uploads/1/3/4/7/134753674/mirevutinosudavumor.pdfIn PDF document text
    • https://cdn.sqhk.co/dubutemaruxu/LHhcghe/blood_and_glory_2016_movie.pdfIn PDF document text
    • http://bridgecommerce.com/gusonomubozw1xqv.pdfIn PDF document text
    • https://cdn.sqhk.co/fonizijodi/fQSfO8U/67889852711.pdfIn PDF document text
    • https://cdn.sqhk.co/xenumobavun/sdjnvjc/siraketizikudotazupowuj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/jozetej/effective_academic_writing_4_answer_key.pdfIn PDF document text
    • http://weverikovufom.rf.gd/92759996986.pdfIn PDF document text
    • https://s3.amazonaws.com/zalomi/5959325203.pdfIn PDF document text
    • http://weketabafizevu.epizy.com/76136507748.pdfIn PDF document text
    • http://rikasajase.rf.gd/aimbot_roblox_phantom_forces.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c568.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC568 5152 bytes
SHA-256: 5f79d07e613146295738494ae56c35399ca55ddb5095b97800feabb4865d9485
font_01_sfnt_off0000d6ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FF 9908 bytes
SHA-256: d0be56d9da109a2df3a15de5dcabc212fb3dc22d0316af61d18fa8a7de7fb25d
font_02_sfnt_off0000f8d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8D7 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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