Malicious PDF — malware analysis report

Static analysis result for SHA-256 e16fb71c44f5f302…

MALICIOUS

PDF

71.5 KB Created: 2021-03-12 07:01:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b9840bbbe64d2c119926c2b1ff31bb42 SHA-1: bc7e25836f469fbe8cff99693b876064fd275bdb SHA-256: e16fb71c44f5f302b75ef7f3bc69d7faaa49d21c57b81eaec47eb3bd196fa3c6
136 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains heuristics indicating it is a phishing lure, using an SEO redirector to lead users to a malicious site. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing campaign designed to trick users into downloading further malicious content.

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://resalured.ru/123?utm_term=characteristic+of+bacteria+worksheet PDF link annotation
    • http://bopugafuwu.scienceontheweb.net/causative_have_and_get_exercises.pdfIn PDF document text
    • http://sejanagewo.iblogger.org/dewalt_dw745_table_saw_manual.pdfIn PDF document text
    • http://zopokujejisolan.getenjoyment.net/symbolic_violence.pdfIn PDF document text
    • http://lazokiwumemo.mygamesonline.org/28807976640.pdfIn PDF document text
    • http://gemofesane.medianewsonline.com/daewoo_5_000_btu_manual_window_air_conditioner_dwc-0520fcl.pdfIn PDF document text
    • http://nazorizuz.medianewsonline.com/86533199609.pdfIn PDF document text
    • http://fakutuzogazu.sportsontheweb.net/prince2_agile_book.pdfIn PDF document text
    • http://vivaxuza.iblogger.org/bugasazik.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/443e53b8-9ff8-45dd-afa9-c655657bef46/sutiwofokujubip.pdfIn PDF document text
    • https://s3.amazonaws.com/betefowubevat/nagerapagike.pdfIn PDF document text
    • https://s3.amazonaws.com/popisiburewixuj/que_significa_la_palabra_cizana_en_la_biblia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2f68dd4-0b31-479e-a39d-abdb66d2cf5e/echo_srm_230_weed_eater_parts.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/javascript_alert_html_format.pdfIn PDF document text
    • http://fafumemoponan.rf.gd/english_synonyms_books.pdfIn PDF document text
    • http://rabewifawilowe.epizy.com/58078633307.pdfIn PDF document text
    • http://zakutipatijike.rf.gd/calculator_apk_hide_photos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3e9e495-d1c0-42f6-ba0e-bd97b6103be7/how_to_start_a_computer_repair_business_reddit.pdfIn PDF document text
    • https://s3.amazonaws.com/pusixa/html_css_javascript_tutorial_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93803eeb-3681-4ede-8ef2-465ba5f67485/norstar_m7310_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/dell_precision_m4600_i7_specs.pdfIn PDF document text
    • http://suwedafi.epizy.com/sekonic_l-758dr_digitalmaster_inkl._rt-32_modul.pdfIn PDF document text
    • http://punotonaduwize.atwebpages.com/3._bundesliga_spielplan_18_19.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_off0000dc1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC1A 5140 bytes
SHA-256: fd8a4f68bc046360535d234f07f75806e7dad6628a1299b2de6907baa0c25b5c
font_01_sfnt_off0000eda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDA0 10312 bytes
SHA-256: fd1b15d61e9f5ba630a2f4f519dbfb0a871b22aa75a9f8719981b285eb8edb06

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