Malicious PDF — malware analysis report

Static analysis result for SHA-256 dac3ce4b2b902d1b…

MALICIOUS

PDF

76.3 KB Created: 2021-03-14 20:38:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5a20fd46f290b985308550ff78d4d885 SHA-1: d4b36083b90a63624c0c4110ec2053a0600e01d9 SHA-256: dac3ce4b2b902d1b725c2b6b49cce9af588aa032bb86fd9b3a04881a14a90da2
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a high-severity heuristic indicating it's a lure for SEO redirectors, specifically for 'free-download phishing'. The embedded URL https://vilenefex.ru/wix?keyword=d%2526d+all+gem+dragons is identified as a redirector. ClamAV also detected this as a phishing trojan. While no scripts were extracted, the overall pattern suggests a phishing attempt designed to lead the user to a malicious download.

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://vilenefex.ru/wix?keyword=d%2526d+all+gem+dragons PDF link annotation
    • https://cdn.sqhk.co/dasadogiso/Vrkhagc/vintage_floral_peel_and_stick_wallpaper.pdfIn PDF document text
    • https://cdn.sqhk.co/sepunaro/iaKjgjf/tawaforutenojapo.pdfIn PDF document text
    • https://cdn.sqhk.co/togodawexu/viagdha/99167272988.pdfIn PDF document text
    • http://zilijakal.iblogger.org/zazuzu.pdfIn PDF document text
    • https://cdn.sqhk.co/jazepoxamib/ibAOg7r/fundamentals_of_international_business_textbook.pdfIn PDF document text
    • https://cdn.sqhk.co/vibebexez/cBsA6YT/top_10_business_newspapers_in_the_world.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/fewifuwu/bully_english_3_answers_xbox_360.pdfIn PDF document text
    • http://gugamofizuxeg.epizy.com/ic_741_comparator_datasheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nemafu/53163251231.pdfIn PDF document text
    • https://s3.amazonaws.com/ronatiduzoxij/spotify_hack_apk_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/mukutud/unicorn_cootie_catcher_template.pdfIn PDF document text
    • https://s3.amazonaws.com/waduzirader/83285450890.pdfIn PDF document text
    • https://s3.amazonaws.com/muxegeza/40705616402.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/313e9115-3bc8-441d-9ad6-12ffd4962bab/cours_de_grammaire_franaise_gratuit.pdfIn PDF document text
    • http://lopusenegi.epizy.com/this_is_water_what_i_want_is_the_ocean_quote.pdfIn PDF document text
    • https://s3.amazonaws.com/xijilesuzuxo/jasagexubedafefog.pdfIn PDF document text
    • https://s3.amazonaws.com/nitidadufetenu/bikigapexusexiwe.pdfIn PDF document text
    • https://s3.amazonaws.com/lukepepe/47869694910.pdfIn PDF document text
    • http://mijikudetixo.epizy.com/96063607655.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/01811d4c-60fa-4661-9d99-2fd94ab56f4f/mekorugu.pdfIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/zekidilegete.pdfIn PDF document text
    • https://s3.amazonaws.com/jazamerijekufol/2006_chevy_cobalt_owners_manual.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_off0000f05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF05D 4156 bytes
SHA-256: 58eabb24298f18ab3cb5c3f3a5652a185830994b36fd37cd9ad46fcf77495092
font_01_sfnt_off0000fe8c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE8C 11376 bytes
SHA-256: f7b28194637eabc73da402e16fe9b4fb333061957461c85cb4430665c40c24de

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