Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe35e5d61112744…

MALICIOUS

PDF

76.1 KB Created: 2021-02-16 22:54:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 78eb4901ca02acf698d999a1a39dd39a SHA-1: df9b8e6d5e1a5502ed3df8d3f1e6aa923ccfd475 SHA-256: 6fe35e5d611127443e858cd24a78211dffcd95e95a82000fd0a74c5b4bc55384
194 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains embedded links that point to known malicious redirectors, specifically identified as a lure for free downloads or phishing. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were extracted, the presence of malicious URLs and the nature of the heuristics suggest the document is designed to redirect users to malicious sites, likely for phishing or to download further payloads.

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=flir+one+pro+lt+review In PDF document text
    • http://lemixebu.22web.org/gitlab_wiki_markdown_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/pevizopubok/diekWr4/driving_school_sim_2020_ovilex_ios.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fd9249a66be3.pdfIn PDF document text
    • https://cdn.sqhk.co/kopilixa/gjbgF7L/uno_customizable_wild_card_rules.pdfIn PDF document text
    • https://cdn.sqhk.co/rowojazur/gijhci6/goat_simulator_all_trophies_goatville_xbox_360.pdfIn PDF document text
    • https://cdn.sqhk.co/faxinomitux/aigd3WY/nujojefuvizopapibasos.pdfIn PDF document text
    • https://cdn.sqhk.co/dukosisevu/hbLhhie/geopolymerization_of_mine_tailings.pdfIn PDF document text
    • http://kujazudoxiro.22web.org/physical_inventory_report_in_sap_abap.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/petubapizo/celine_dion_biography.pdfIn PDF document text
    • https://s3.amazonaws.com/nakuzafol/arab_health_2019_post_show_report.pdfIn PDF document text
    • https://s3.amazonaws.com/daniwodug/chopsticks_waltz_sheet_music.pdfIn PDF document text
    • http://vaxokepa.rf.gd/28219132889.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/damofawubosikapepekotujul.pdfIn PDF document text
    • https://s3.amazonaws.com/resisuna/39869374468.pdfIn PDF document text
    • https://s3.amazonaws.com/pafexegud/addition_and_subtraction_worksheets_with_answer_key.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_off0000d700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD700 4320 bytes
SHA-256: 2040058b420fdbc9a9c9ef4b3c834cfa8cbcc5d62a98d32ce89d2ec5f6b6fdb6
font_01_sfnt_off0000e5b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B7 15168 bytes
SHA-256: ec2b82c8966e6023ac265eecd91adcb0b92f43c970a63c47a373fef83912b52f
font_02_sfnt_off000115ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115AE 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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