Malicious PDF — malware analysis report

Static analysis result for SHA-256 b762ecb8c6b69bfc…

MALICIOUS

PDF

72.5 KB Created: 2021-02-22 06:24:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 0ecf8da3b1a3b8962791b130e6472163 SHA-1: 5b5fb9f8c6b7b20d1520bcc88c81ee70150b5495 SHA-256: b762ecb8c6b69bfc81204d30c3dd2dc6d3d56de63a39605694a58a295e6a0fae
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to Weebly and other domains, indicative of a link farm or redirection scheme. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards an attack pattern involving the redirection of users to potentially malicious external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jacksth.ru/aws?utm_term=starbucks+employee+study+guide PDF link annotation
    • https://vomerigovelaj.weebly.com/uploads/1/3/4/9/134901888/3305cb66a0d.pdfIn PDF document text
    • https://zunenevalomedo.weebly.com/uploads/1/3/4/8/134855990/6284487.pdfIn PDF document text
    • http://form-lnstagramcopyrightservice.com/nafizabetotost1ibd.pdfIn PDF document text
    • http://erkutungotu.com/25364226952zloj0.pdfIn PDF document text
    • https://cdn.sqhk.co/rukugewul/eJuglgj/attitude_dope_wallpaper_hd_iphone_6.pdfIn PDF document text
    • http://help-lnstagramcopyrights-verify.com/86822419168p2v5f.pdfIn PDF document text
    • https://parafobosa.weebly.com/uploads/1/3/1/8/131857791/kenit.pdfIn PDF document text
    • http://arevakar-travel.com/bukemakobomigg30dg.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/libusamagowuvo/bnmu_part_2_result_marksheet_2019.pdfIn PDF document text
    • https://s3.amazonaws.com/paxivogedewilu/68863023686.pdfIn PDF document text
    • https://s3.amazonaws.com/wixatax/best_bass_boosted_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tarajix/wigutawurupebonimatazurus.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/identifying_nouns_worksheet_year_2.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_off0000dd42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD42 5804 bytes
SHA-256: 0c19f5d549fa6fcbb865e4eb15e6ffe28be028a18c53b3c07e47ed96d21405ed
font_01_sfnt_off0000f0f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F4 10732 bytes
SHA-256: 410c0b2a7fa18b7253cdd9ce8cdd4d35ad55e7fcb6eb1f95e71b98da73293d02

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