Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b0e09004dc69d90…

MALICIOUS

PDF

68.6 KB Created: 2020-11-10 23:50:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: 312663a1c24454c3fde3ab8cb505e347 SHA-1: d670dbb57f22c07d7b859466c8089ff84652f85e SHA-256: 3b0e09004dc69d90a91e587654812b2f89d42fcb93c40b4d70b9ca1f11beb434
214 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, including a known malicious redirector and a link farm designed to host many PDFs. The heuristic firings indicate the document is a malicious redirector and part of a link farm, strongly suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the ClamAV detection further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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?keyword=manual+muscle+testing+knee In PDF document text
    • https://rinojoxo.weebly.com/uploads/1/3/4/5/134598976/pixufobaje_revutodufan_vowozezinar_pugibep.pdfIn PDF document text
    • https://zigegawemofeza.weebly.com/uploads/1/3/1/4/131406932/tafafebupabepot_sonezoxadewo.pdfIn PDF document text
    • https://satobolusiv.weebly.com/uploads/1/3/1/3/131398412/678b7498c.pdfIn PDF document text
    • https://dogirewepa.weebly.com/uploads/1/3/1/8/131856222/selulosa_nijusoganimulo_xixonugoj_sowalijanolafe.pdfIn PDF document text
    • https://weratirotiset.weebly.com/uploads/1/3/4/3/134322017/seronedegiwarepuv.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/9792c2cb-33f7-4576-b0fb-38458cadac55/kuwawegudoxirulonafodixo.pdfIn PDF document text
    • https://s3.amazonaws.com/tazibabebamep/tipos_de_investigacion_cientifica.pdfIn PDF document text
    • https://s3.amazonaws.com/sezebepit/kugejopedugaroga.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/dark_souls_3_game_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/zufaxepixiguxax/bezovujeragab.pdfIn PDF document text
    • https://s3.amazonaws.com/jepinebawo/vabaz.pdfIn PDF document text
    • https://s3.amazonaws.com/vekodupiwarobi/20017345844.pdfIn PDF document text
    • https://s3.amazonaws.com/xupovobejanam/tuteriwaxututobu.pdfIn PDF document text
    • https://s3.amazonaws.com/mamibis/68329493068.pdfIn PDF document text
    • https://s3.amazonaws.com/tomamujuf/supra_mayro_kratt_play.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_off0000d08d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08D 5092 bytes
SHA-256: cadda0350ebae0c3728782f9ddd252aba93e91ab73eda754b9fba1dcfb380200
font_01_sfnt_off0000e1e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E2 10484 bytes
SHA-256: f2b5a52d1f387c420748753bde68c3372ea567c5bfce5c57375a12232d8c0191

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