Malicious PDF — malware analysis report

Static analysis result for SHA-256 2839bcab6404835b…

MALICIOUS

PDF

69.6 KB Created: 2020-12-24 13:16:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 04814b0b56064fcea51192ba26cbaec7 SHA-1: d79b9706d7f79ea5b97a3a593ddbb89ac7271c2d SHA-256: 2839bcab6404835b13983bac20d8b3c50a87742861328304e3ab8b06a023e28e
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external PDF files, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://traffmen.ru/aws?utm_term=agility+drills+for+football+pdf In PDF document text
    • https://fibavizenimi.weebly.com/uploads/1/3/4/4/134485548/fbdb4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4422144/normal_5f9f76a399ac6.pdfIn PDF document text
    • https://cdn.sqhk.co/xisiwuba/heiijgJ/webtoon_promo_codes_oct_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468286/normal_5fb2c41d66430.pdfIn PDF document text
    • https://cdn.sqhk.co/susiwozobo/ajNgojh/bijexefajivagogen.pdfIn PDF document text
    • https://cdn.sqhk.co/kuruwoke/gj4jcjg/58878117934.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371790/normal_5fd1c33878d5a.pdfIn PDF document text
    • https://cdn.sqhk.co/bifugudawesu/ShhQcpG/diamond_shop_ff_murah.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420031/normal_5fc339f92afa5.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/babab43b-ffe1-4386-9a1c-b3ce76d961dd/chaparral_high_school_parker_co_calendar.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/income_tax_aadhaar_link_pan_card_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58e7a726-06b0-42f3-aab2-98f163cf5ddb/40869475397.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/abfd2cf2-23ec-410c-8d71-398c1f897fd3/mejijavekemuv.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD389 5440 bytes
SHA-256: 4c395ea7c6aae574752fcb8f84923540c3575799dc96537691be0c8f15039e46
font_01_sfnt_off0000e620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE620 10380 bytes
SHA-256: 23690b8317521933d304fdfaff9394a947078dc9d4098783ce4c5536abfdd98d

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