Malicious PDF — malware analysis report

Static analysis result for SHA-256 b91ac4240b16d97f…

MALICIOUS

PDF

73.0 KB Created: 2021-02-17 08:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2026-06-05
MD5: 0ffb9b01177793a1c26c1b3bb85ea070 SHA-1: f7efcb6782da5f55e0633e756b6b9c1c928660b9 SHA-256: b91ac4240b16d97f5e1f254e8a2acefe305533695b956bd2f34375950d2d4891
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a link disguised with a search query related to 'Dean Koontz movies Netflix', which redirects to the known malicious domain 'yafferge.ru'. This indicates a phishing or malware distribution attempt, likely delivered as an attachment. While no scripts were explicitly extracted, the PDF structure and embedded links strongly suggest malicious intent, aligning with common phishing lures.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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.
  • 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://yafferge.ru/123?utm_term=dean+koontz+movies+netflix In PDF document text
    • https://cdn-cms.f-static.net/uploads/4370068/normal_600c761db730a.pdfIn PDF document text
    • http://rifubabesepa.iblogger.org/hoedown_sheet_music_whose_line.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401515/normal_5feee31a750e5.pdfIn PDF document text
    • https://cdn.sqhk.co/vuwonesi/d0hgjh2/66763961975.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425916/normal_5fd9a074a9075.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376371/normal_5ff86a2767fa3.pdfIn PDF document text
    • https://cdn.sqhk.co/kobewudojuvo/fspijif/cut_the_rope_magic_box_level_25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451348/normal_601a29b37feb9.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/rozebofukixus/distributive_shock_treatment_guidelines.pdfIn PDF document text
    • http://fusarafabar.epizy.com/bootstrap_4_psd_free.pdfIn PDF document text
    • http://sobezoneroli.epizy.com/rewulezep.pdfIn PDF document text
    • http://gorobibo.epizy.com/google_assistant_settings_android_tv.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/ism_code_and_guidelines_2018_edition.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/hand_lettering_worksheets_free.pdfIn PDF document text
    • https://s3.amazonaws.com/rixevozajixezos/action_vishal_movie_teaser.pdfIn PDF document text
    • https://s3.amazonaws.com/xugigabitulu/disputing_credit_report_credit_karma.pdfIn PDF document text
    • https://s3.amazonaws.com/wowonesoribu/fiduciary_duty_meaning.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_off0000e17e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE17E 5056 bytes
SHA-256: 24bc4016b85fe97e832c1154ddfcc1d89bb289d5d5747129efad792d1c4416c3
font_01_sfnt_off0000f2c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2C2 10604 bytes
SHA-256: b39ea8d59fff9d79621314b8f2704eeda9a58ea2ed9ec540bbcdca0ec5a65416

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