Malicious PDF — malware analysis report

Static analysis result for SHA-256 045c92874c9dbd30…

MALICIOUS

PDF

78.0 KB Created: 2021-04-01 00:59:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ded9fce4d947e60f6d31d555a3ba86e1 SHA-1: bc51c4d1c67663ff1e3fe3fa3d5f58c53c76b349 SHA-256: 045c92874c9dbd308e2e43e43bf1c83756051e18f97d33434cc45647592c38a3
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a high-severity rule indicating it's an image lure linking to an SEO redirector for phishing. The ML classifier and ClamAV also strongly indicated maliciousness. The primary IOC is the external URI used for redirection, which is characteristic of phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=prisoner+b+3087+quotes PDF link annotation
    • http://brandframeb.com/mp4_movies_download_2015_bollywoodwr6jj.pdfIn PDF document text
    • http://nasufulorejuwe.mywebcommunity.org/adobe_premiere_pro_2017_price.pdfIn PDF document text
    • http://jobs-ingenieur.best/1257096826k3t8s.pdfIn PDF document text
    • http://zifixoribe.scienceontheweb.net/cadmio_en_cacao.pdfIn PDF document text
    • http://igcopyrightforhelps.com/microsoft_office_powerpoint_templateqbd3f.pdfIn PDF document text
    • http://health-top.ru/78414871370o5rec.pdfIn PDF document text
    • http://contact-git.top/why_my_mobile_hotspot_is_not_showing_in_other_devicesln2y1.pdfIn PDF document text
    • http://idealslim-italiaofficial.site/13186161476l86wf.pdfIn PDF document text
    • http://tujidal.mypressonline.com/letter_c_worksheets.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/xupovobejanam/2014_lexus_es_300_hybrid_for_sale.pdfIn PDF document text
    • https://s3.amazonaws.com/fofeguj/power_electronics_international_peru_s.a.c.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9594e15c-812e-4221-a3b6-582e9d001559/26269441802.pdfIn PDF document text
    • http://bufijonewufo.onlinewebshop.net/biblical_dream_interpretation_book.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c25e931d-313a-486f-9768-8affcd7c1894/68549134424.pdfIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/characteristics_of_matter_worksheet_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f7f712a-bf20-463b-a264-ef3b3bc68a27/jipojabukipu.pdfIn PDF document text
    • https://s3.amazonaws.com/dubiditiginowo/world_capitals_quiz_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/rujimidujek/electric_koolaid_acid_test_quotes.pdfIn PDF document text
    • https://s3.amazonaws.com/kozewuposoridil/vebanapud.pdfIn PDF document text
    • https://s3.amazonaws.com/zinudipir/fuxasabumivup.pdfIn PDF document text
    • https://s3.amazonaws.com/memexelu/mixotupuwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3122a189-aafa-413e-8bc9-174d6be03b79/loxitatijojat.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_off0000f0c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0C0 5284 bytes
SHA-256: 2290f30d665de14c66c8811228e02f0d7dbc8d6c29a10cda49a6699abb6594ea
font_01_sfnt_off000102d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D5 11456 bytes
SHA-256: 9d44cbcc6b46d5d306f5fc3a68a6f4064bcf3d0c3c0cfb49caecd012c4dc5e31

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