Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e5bde25d11cbf98…

MALICIOUS

PDF

103.2 KB Created: 2021-05-20 01:21:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: c0a956e4ffb8c4e12748b18e90e72286 SHA-1: 8f6bbc3c96bca2d55d4adc80f9abe34f4e0efc6e SHA-256: 3e5bde25d11cbf9827432867ef0b7f0cc9002144cc2c058a6ec37583194d4d21
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious content. The ML classifier also returned a high score for maliciousness. While no scripts were explicitly extracted, the PDF structure and link farm behavior strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://druttle.ru/strik?utm_term=tinkers+construct+best+armor+plates PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4464995/normal_5fca8265995b8.pdfIn PDF document text
    • https://feroxetisilujux.weebly.com/uploads/1/3/1/4/131409167/renofizujarilaw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445570/normal_6065e10951f62.pdfIn PDF document text
    • https://wipedevibenisi.weebly.com/uploads/1/3/5/3/135315865/340ac2.pdfIn PDF document text
    • https://basosogufu.weebly.com/uploads/1/3/4/6/134682995/2870801.pdfIn PDF document text
    • https://nijumaweka.weebly.com/uploads/1/3/1/3/131379182/silun.pdfIn PDF document text
    • https://felixitu.weebly.com/uploads/1/3/4/0/134012625/7013955.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/3702321.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428334/normal_6060fca14abbd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471512/normal_5ffe0147e50d0.pdfIn PDF document text
    • https://nixotebiwozo.weebly.com/uploads/1/3/4/6/134667174/a1a55f43ee.pdfIn PDF document text
    • https://saposoralax.weebly.com/uploads/1/3/6/0/136025319/gakanijozasi.pdfIn PDF document text
    • https://vupebuxotilejo.weebly.com/uploads/1/3/0/8/130814562/2047250.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/wukaguz.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/pusori/77262695760.pdfIn PDF document text
    • https://s3.amazonaws.com/buponuwebi/can_sealing_machine_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90b02b8f-3116-4d50-ad99-256288e06b49/poralavenefuki.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef6ac87d-1f79-42b3-923a-cc0256e441e5/f70_duet_dryer.pdfIn PDF document text
    • https://s3.amazonaws.com/dazuxujepov/38855185945.pdfIn PDF document text
    • https://s3.amazonaws.com/gopifu/finding_percentages_worksheet_with_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3f91f69-4fe8-4baf-abdd-26199d102351/2005_chevy_malibu_starter_location.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_off00014641.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14641 5116 bytes
SHA-256: 14a8fa777a3d5a94bc4d1efa3bda4fa49c3ace734718925678b929132ab552d9
font_01_sfnt_off00015780.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15780 12180 bytes
SHA-256: 9df7c2291e40e92edc0505e02084012a80b440bfa9ed12a525d2394ce688f9bc
font_02_sfnt_off000180bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x180BD 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230