Malicious PDF — malware analysis report

Static analysis result for SHA-256 0b8149e9bc32cf39…

MALICIOUS

PDF

85.6 KB Created: 2021-02-25 13:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: f9a5a0e7efe041269448772f764de3ef SHA-1: a2b0fe677adeb3cf380a709c7b400faa5292c05a SHA-256: 0b8149e9bc32cf39f3436b2047ce99b8725d4aa17ada4961f91a2187618d944f
194 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious redirector links, specifically pointing to 'crophysi.ru'. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were extracted, the presence of malicious links and the document's structure suggest it's designed to lead the user to a malicious site, likely for phishing or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://crophysi.ru/wix?keyword=watch+joker+free+online+no+registration In PDF document text
    • http://zabavnyi-slon.ru/music_arranger_app_androidjkpi2.pdfIn PDF document text
    • http://dimozakebaba.scienceontheweb.net/pride_and_prejudice_movie_online_subtitrat.pdfIn PDF document text
    • https://cdn.sqhk.co/sofilita/geihjbv/kaiser_security_jobs_sacramento.pdfIn PDF document text
    • http://nesobaka7.xyz/guideline_definition_architectureu9eeo.pdfIn PDF document text
    • http://1eyvgo.xyz/10._principios_de_la_economa_de_movimientosht3b7.pdfIn PDF document text
    • http://uanews.website/3358136567u3mfb.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/kuboki/blockhead_crossword_answer.pdfIn PDF document text
    • https://s3.amazonaws.com/sebunuzu/vuxitugawazijavufadejaga.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/budweiser_logo_eps.pdfIn PDF document text
    • http://zukegavodobuxas.epizy.com/sutozotitaruwaxokamata.pdfIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/bedingte_formatierung_excel_farbe_zelle.pdfIn PDF document text
    • https://s3.amazonaws.com/watajive/totixategubupujemajep.pdfIn PDF document text
    • http://gumuwojurigab.epizy.com/pain_assessment_tools_nursing.pdfIn PDF document text
    • https://s3.amazonaws.com/povodijirig/brainworks_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/do_foster_parents_get_paid_in_arizona.pdfIn PDF document text
    • https://s3.amazonaws.com/bubodeliza/18352427947.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001135c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1135C 5296 bytes
SHA-256: 12ba5c3a57adf61b94dda38f425f9c58a80874db8b845f9f638382942130be56
font_01_sfnt_off00012576.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12576 10412 bytes
SHA-256: aba4a03064843b01ae98c136098463c725943b9fd125e208cf879a5c724bc759

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