Malicious PDF — malware analysis report

Static analysis result for SHA-256 05c6541c98fd1b0b…

MALICIOUS

PDF

96.8 KB Created: 2020-11-16 21:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bddf64ca7976d70f21c4b488b48c6160 SHA-1: 48c8132ad697473f7b225d580a94971efa364165 SHA-256: 05c6541c98fd1b0bb38e70ac6a4b136dc214f2371a71ba3f948c3269dffef2a0
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious and phishing-related. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or redirection mechanism. While no scripts were explicitly extracted, the PDF structure and external link farm heuristic indicate a malicious intent to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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://trafficel.ru/strik?utm_term=shukan+akb+ep+10 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4413707/normal_5f94634aacacc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475872/normal_5fad5d753dbd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495975/normal_5faa477c517d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402953/normal_5fa058b0e84ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373004/normal_5f8a2b496609f.pdfIn PDF document text
    • https://sivifarikajuleg.weebly.com/uploads/1/3/4/4/134487261/b20dffb5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366395/normal_5f96785df2d09.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390664/normal_5fa31eeed1ead.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/purawuma/kurewosunubize.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/tajapulixarav.pdfIn PDF document text
    • https://s3.amazonaws.com/febopa/65539201017.pdfIn PDF document text
    • https://s3.amazonaws.com/tujeviwakirawu/monibo.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/jeff_shore_zen.pdfIn PDF document text
    • https://s3.amazonaws.com/zurovajij/bubble_spinner_2_dead_whale_full_screen.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/52594641775.pdfIn PDF document text
    • https://s3.amazonaws.com/bitizopovopaso/tibofozatakadabewobesugu.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ebdb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBDB 13732 bytes
SHA-256: 242c26a9b7b98c93eba6cbd94cf3ea3d621cac394c0edaaa57a82208d04802e0
font_01_sfnt_off0001170d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1170D 4744 bytes
SHA-256: 8641f2540023b7974d11a54e1f4a3074c0e76a52dd7eea3b3a7964f9be3f3070
font_02_sfnt_off00012715.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12715 12284 bytes
SHA-256: 425fd73b9305f99db7281bf69e46004e5e561598fc5ae247119d863982e39a21
font_03_sfnt_off00014fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FD3 16564 bytes
SHA-256: e03822c4c64fb29368a4ce0ff3288a2046d2a5fc2d9e0f531fa8bd271b788570
font_04_sfnt_off0001665e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1665E 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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