Malicious PDF — malware analysis report

Static analysis result for SHA-256 651668c633787a43…

MALICIOUS

PDF

112.9 KB Created: 2021-01-10 09:34:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 8d754a7b935f319209fdd6c4e738347a SHA-1: 0182a62734e6e500a058d4b6c58e1432055ea32b SHA-256: 651668c633787a43407ebd6f67f916985db056d31efc0065cb3c33548730f01d
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, many pointing to other PDFs, suggesting a link farm or SEO manipulation tactic. The document body, though heavily obfuscated, contains metadata related to PDF generation and potentially misleading text. The presence of external URIs and a PDF link farm heuristic strongly suggests the document is designed to redirect users to potentially harmful websites.

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://trafficel.ru/aws?utm_term=definition+of+technology+by+different+authors+pdf PDF link annotation
    • https://cdn.sqhk.co/retirijozi/jaWeTge/56867617475.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/VgdFfsr/miroremerirodepu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451757/normal_5fc26a4e35290.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_5f95e9ef9c3dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465396/normal_5fb64031e3a51.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisuvov/ghedghg/budajasisemefubenurine.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/ih9EOhd/kaputiwosewewavesiforiban.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367925/normal_5fe2167d2de26.pdfIn PDF document text
    • https://cdn.sqhk.co/galemojubemo/jeOighi/92932238284.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385427/normal_5f8c666ba93ac.pdfIn PDF document text
    • https://fojogozad.weebly.com/uploads/1/3/4/7/134704798/2545172.pdfIn PDF document text
    • https://zewuxufasebi.weebly.com/uploads/1/3/4/3/134320084/kudegakikatek-razokumelirarix-tevojanizob.pdfIn PDF document text
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/5b1fbbce5f714c6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/65786693444.pdfIn PDF document text
    • https://s3.amazonaws.com/xalasawu/math_minutes_5th_grade_worksheets.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_off00017b88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17B88 5660 bytes
SHA-256: 41686658e94c485db4351a3b97fe9d1b34b0da21030c3d16954b88337a0ece60
font_01_sfnt_off00018ec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EC9 11624 bytes
SHA-256: abdfcc7ffd3721afbc9dc3d77f35a27171d4dafcb841b76cf28b661ab063b2f9

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