Malicious PDF — malware analysis report

Static analysis result for SHA-256 b81936ec5c43bb7e…

MALICIOUS

PDF

77.2 KB Created: 2021-02-23 23:45:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 2daefe7d37c18f0beb1444fa49282424 SHA-1: 8dfd62bbd24bbf45f1fc715e2563e0ee2f722ca8 SHA-256: b81936ec5c43bb7e8b9564b962461c03cb2e50eb4a4c26e8c4307aa77793f5ec
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs, many of which point to link farms and redirectors, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of malicious redirection, likely to a phishing page or to download a secondary payload.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/aws?utm_term=gevalia+coffee+maker+program+instructions In PDF document text
    • https://nofefikow.weebly.com/uploads/1/3/4/5/134510094/93e47f051afd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487381/normal_5feb78f352e56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482407/normal_5fd6cb6a49c28.pdfIn PDF document text
    • https://cdn.sqhk.co/tajudozizif/hbggOhn/ancient_history_of_west_africa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387712/normal_5fe01b252fd77.pdfIn PDF document text
    • https://pagejenaxupiwig.weebly.com/uploads/1/3/4/3/134383440/nipopasomas-buwuzusafimaxot-kutewomozen-wikedazifosuvi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449417/normal_5ff12fa37345b.pdfIn PDF document text
    • https://cdn.sqhk.co/kemivabesu/jJijfji/bigo_live_download_apk.pdfIn PDF document text
    • https://sabiwivilo.weebly.com/uploads/1/3/4/3/134316676/xilajim_loban.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410462/normal_60203495d2218.pdfIn PDF document text
    • https://cdn.sqhk.co/fenazijeguk/6UjagjV/samsung_blu_ray_player_audio_output.pdfIn PDF document text
    • https://cdn.sqhk.co/duvetezoje/eEKhbhf/la_redoute_clothing_sale.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471711/normal_5ff05e9b15545.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484365/normal_5fe880fdce727.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/xovajukoxin/lukejupereb.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_off0000e335.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE335 5372 bytes
SHA-256: a6eeee056c97cf8faed4e12fd09eafa888c0770a2bd5c6996fc007687bf6d589
font_01_sfnt_off0000f57a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57A 10492 bytes
SHA-256: 8dea91ed9ada1543169c1c16e871890b69b077244f9cfa3d26b0831811530514
font_02_sfnt_off00011932.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11932 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.