Malicious PDF — malware analysis report

Static analysis result for SHA-256 b53d45aa57eb0513…

MALICIOUS

PDF

73.6 KB Created: 2021-01-15 13:07:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 259a165a21b32fbb5e60c5121b16029a SHA-1: c94220723ae9984ca6c38f08fe8087b8ab01803a SHA-256: b53d45aa57eb05137ddbed4dae971bcefa7f40f5f1830160135ad505ef635516
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, many pointing to potentially malicious domains, as indicated by the 'PDF_SEO_LINK_FARM' heuristic and the ClamAV detection. The ML classifier also strongly flagged this PDF as malicious. The presence of embedded URLs suggests an attempt to redirect users to phishing or malware-hosting sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://trafffe.ru/123?utm_term=physical+science+2nd+semester+study+guide PDF link annotation
    • https://site-1168215.mozfiles.com/files/1168215/100_pics_emoji_quiz_answers.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464709/normal_5fbe023833746.pdfIn PDF document text
    • https://worobewunit.weebly.com/uploads/1/3/1/4/131406731/0b0693d4bb.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/tuxenipup/kizumukaluwepizuw.pdfIn PDF document text
    • https://s3.amazonaws.com/posufij/44837933472.pdfIn PDF document text
    • https://s3.amazonaws.com/kelukakeb/98404015055.pdfIn PDF document text
    • https://s3.amazonaws.com/zabevog/67003710742.pdfIn PDF document text
    • https://s3.amazonaws.com/nodetuxapabara/lizozukimoninibapezi.pdfIn PDF document text
    • https://s3.amazonaws.com/jijari/xopux.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_off0000d529.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD529 5360 bytes
SHA-256: 7b43b406a6f8f9d2c0e890372e73c17ee7a5b8591d5b5a26681a23809ecf97dc
font_01_sfnt_off0000e725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE725 10820 bytes
SHA-256: 828fd473d655335fddd041824a8bf2a81de6b4e1cf516ca7ac74b9265da63b75
font_02_sfnt_off00010bda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BDA 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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