Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b8fbfd137a6fe81…

MALICIOUS

PDF

109.2 KB Created: 2020-11-20 03:17:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7c05db96c05baeef7e59d9cb67fca4cc SHA-1: 887c6d415f653a358da8adc1b69110be24516999 SHA-256: 4b8fbfd137a6fe811f4348f173fe5b4a1a41eb6d9a97a07043f9298c6b9fa990
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a significant number pointing to Weebly and other hosting services, suggesting a link farm or redirection scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of techniques used to redirect users to potentially harmful content.

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
  • 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.
  • 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://trafftec.ru/123?utm_term=minecraft+teleport+command+switch PDF link annotation
    • https://kebezade.weebly.com/uploads/1/3/4/4/134479439/1523051.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424662/normal_5fabe03ba18ad.pdfIn PDF document text
    • https://subapusufi.weebly.com/uploads/1/3/4/6/134649014/3250827.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449172/normal_5faee96f61340.pdfIn PDF document text
    • https://guwomenod.weebly.com/uploads/1/3/0/8/130873843/ramugimexixepaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386842/normal_5f930c964ce88.pdfIn PDF document text
    • https://jipepusubame.weebly.com/uploads/1/3/4/0/134040653/1e990fdbb954a09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381085/normal_5f8b3a44cb797.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/5d3207fb-6dbf-4b84-abb6-00d661d8c93b/64510390336.pdfIn PDF document text
    • https://s3.amazonaws.com/gebukil/sujenawupotozeluxat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/056c6ca3-2a65-4efb-a34d-844dd435e3e7/4402164534.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba34e18f-e18f-46b0-a4d3-fb45337b7bbd/metra_train_schedule_chicago_to_aurora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/964d33b7-7366-4062-8006-d8b379cd98fa/words_with_naa.pdfIn PDF document text
    • https://s3.amazonaws.com/tosevud/3dmark_full_version_free.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2055689f-37e0-4144-89f0-0bdbd18dfc3a/gobebitiriwoxiparemun.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_off0001638e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1638E 5492 bytes
SHA-256: cb21fa3e0ecfd962b090c64c37bec63b6c7aad2ff9982b00a47c1cbad14478bc
font_01_sfnt_off00017631.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17631 15836 bytes
SHA-256: a70523333d6bf111b19eb3319efd6351f77c6c00e01dec7f49a9896d018e326f

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