Malicious PDF — malware analysis report

Static analysis result for SHA-256 29b9b1c2d49bafeb…

MALICIOUS

PDF

76.2 KB Created: 2021-01-10 01:55:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 05cb6916bc9988d7f4a2ddab3f8dc5e6 SHA-1: e484c2604eb924194ac485f3d66d24d3ed4922c6 SHA-256: 29b9b1c2d49bafeb8b80332490edeb443a586d17573ac047f545197af1c8e861
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

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://trafffi.ru/aws?utm_term=how+have+you+been+holding+up+answers PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4481839/normal_5fe4f1de1b17b.pdfIn PDF document text
    • https://bawuzuxagoju.weebly.com/uploads/1/3/4/3/134340420/mabafuwevelupibituz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374851/normal_5fd5f575853f5.pdfIn PDF document text
    • https://site-1178858.mozfiles.com/files/1178858/evolutionary_theory_of_government_authority.pdfIn PDF document text
    • https://site-1192612.mozfiles.com/files/1192612/ringtone_maker_app_for_iphone.pdfIn PDF document text
    • https://site-1171866.mozfiles.com/files/1171866/16141764401.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/sukobogixe/descriptive_writing_tips.pdfIn PDF document text
    • https://s3.amazonaws.com/dazutun/chalte_chalte_video_song_1080p.pdfIn PDF document text
    • https://s3.amazonaws.com/kegubinefuda/midirabawomitiripixukadax.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/action_essentials_2_2k_free.pdfIn PDF document text
    • https://s3.amazonaws.com/sixolose/adminlte_2._3._8_version.pdfIn PDF document text
    • https://s3.amazonaws.com/megelugik/ar_rahman_hits_tamil_masstamilan.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_off0000ea9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA9F 5576 bytes
SHA-256: ac58633dd2ea48c6f0d6ba0fc466f2bbe33ec48208abb40cb413869909b07e45
font_01_sfnt_off0000fda3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDA3 11340 bytes
SHA-256: 2a0d1d36891f83ae6dc8c641f4eed5826512a75e886f7686dc944f9b8b546dd6

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