Malicious PDF — malware analysis report

Static analysis result for SHA-256 28c0443c2e10240e…

MALICIOUS

PDF

83.6 KB Created: 2021-02-11 12:41:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 97bbd969bccf026621e3270671ca3192 SHA-1: 4f74c7ceb45c4ccdbd3f09e406d4ac6536963966 SHA-256: 28c0443c2e10240e38fceb2e8df7d69c111c82b0a743fb32b0b956d45895b8ce
144 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1204.002 Malicious Link

This PDF file was flagged as malicious by a ClamAV signature and an ML classifier, indicating a high likelihood of malicious intent. The presence of a 'Fake invoice / payment lure' heuristic, combined with an external URI pointing to 'https://bologen.ru/123?utm_term=60+days+in+pays+how+much', strongly suggests a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to payment and dates, reinforcing the lure. No scripts were extracted, but the overall pattern points to a malicious document designed to trick users into visiting a compromised URL.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bologen.ru/123?utm_term=60+days+in+pays+how+much PDF link annotation
    • https://cdn.sqhk.co/delojiwuguj/QZicied/65221409081.pdfIn PDF document text
    • https://cdn.sqhk.co/babijuvawov/jcgckji/pixel_drag_racing.pdfIn PDF document text
    • https://cdn.sqhk.co/xovikojux/hUcgjjb/33586863541.pdfIn PDF document text
    • https://cdn.sqhk.co/jesisoritet/SMjhRjd/toy_cube_crush.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489412/normal_5fd3b8a87a22b.pdfIn PDF document text
    • https://cdn.sqhk.co/ripowusaro/jAthiZe/90113673523.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390999/normal_601d75479aa45.pdfIn PDF document text
    • https://cdn.sqhk.co/dabigewom/YYhhYhb/bufejadex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393362/normal_5fd0990958948.pdfIn PDF document text
    • https://cdn.sqhk.co/nebemina/nha7ibO/kidoferoxejoriji.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/savifin/76901690136.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/48079163639.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/leon_county_booking_report_november_4_2019.pdfIn PDF document text
    • http://gujomodezeroj.epizy.com/analyzing_financial_performance_reports_slideshare.pdfIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/agnisakshi_title_song_free_naa_songs.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_off0000f9b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9B0 5264 bytes
SHA-256: be84937bbc00ab44ad11f18f62711751eeef257125f574dcdb8f9684789c1c44
font_01_sfnt_off00010b64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B64 12100 bytes
SHA-256: 8b13f61f299b590772e2f0924f2acca1151b98f6cb61f8dc9c48c3a080fdfe05
font_02_sfnt_off000133c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x133C7 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333

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