Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f8079eaac4e676b…

MALICIOUS

PDF

71.2 KB Created: 2021-03-13 17:29:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: bf181ead7c64988b0380e9e8e5d85960 SHA-1: bbfc579833bf1465cbd8848b6714c7c058296fd6 SHA-256: 7f8079eaac4e676b728e201fedbf97d922b1a4778700e0e41f2c9675c0fb2d9f
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a phishing lure, specifically using a "free-download phishing" tactic with an image that redirects to an external URL. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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
  • 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.
  • 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://dugedepap.ru/award?keyword=diabetes+mellitus+type+2+pathophysiology+pdf PDF link annotation
    • http://gexopidikimo.mygamesonline.org/john_deere_commercial_mowers_for_sale_used.pdfIn PDF document text
    • https://cdn.sqhk.co/jerizukop/PgjQmjf/hiv_testing_guidelines_2015.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/what_is_a_30_day_fitness_challenge.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421640/normal_603b5480c79cf.pdfIn PDF document text
    • https://cdn.sqhk.co/gomurabog/jtfQjHV/texas_music_lesson_plan_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370080/normal_6022297081298.pdfIn PDF document text
    • https://cdn.sqhk.co/juvanejejuwo/ichdhg3/jifabekakawalewom.pdfIn PDF document text
    • https://cdn.sqhk.co/miwiwefe/iaP0jiz/kokosugelagazo.pdfIn PDF document text
    • https://cdn.sqhk.co/navotezive/ibmhd31/75916520324.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/hNjigem/18179343722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393363/normal_603fa715698a9.pdfIn PDF document text
    • http://gukevipagopu.mywebcommunity.org/was_it_a_dream_short_story.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/a23d0ee6-9583-4927-8139-2b43205a6398/78520864540.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/997186f7-fba7-4c01-9836-a2a9b226e451/26002546756.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/991b1652-92ef-45ff-ac87-4e980783365c/vigokuxukojugufiv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99b46ef6-6885-4e14-a201-dac3872153e1/the_warrior_diet_reviews.pdfIn PDF document text
    • http://wazeniwemir.onlinewebshop.net/adopter_categories_and_their_characteristics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47dfc20c-a05f-41b1-b02a-6cc4572239ee/samsung_un32eh5000f_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69eddd13-4264-4543-b557-7a6ebb3ab41e/kunugakutavumajuponuben.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/21183ac6-47b2-4f53-b089-1c2287bdf96d/the_sense_of_an_ending_book_plot_summary.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_off0000d80e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80E 5732 bytes
SHA-256: 6ff50cc6c8a3db1fb4cd271dda83966c13381f8de44de90556fa8a311c289a6e
font_01_sfnt_off0000eb7c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7C 9876 bytes
SHA-256: f42e463cc601d905f79d1b551e49d2d2f87f0a3628d170a597c6de1cc002db71

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