Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e259e7a2ea31df…

MALICIOUS

PDF

67.5 KB Created: 2021-02-14 21:00:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 3f6b5834a4d636a84f6c2dc1a264bf57 SHA-1: d427ae15b9fdd63e72bbd42eb4e8f58b78aa04b8 SHA-256: 71e259e7a2ea31df5c0a94b2b300761349e12441939d18962956969ac246f02c
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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/123?utm_term=vermont+castings+grill+owner%2527s+manual In PDF document text
    • http://reduslim-italiaofficial.site/gezavowigewebef7ppfo.pdfIn PDF document text
    • https://tubenuluni.weebly.com/uploads/1/3/1/4/131437864/1da8586be14.pdfIn PDF document text
    • http://gufutaca5.xyz/free_among_us_for_minecraft_pets_pcs4cig.pdfIn PDF document text
    • https://lowixuwegula.weebly.com/uploads/1/3/0/7/130775587/rutizaxijif.pdfIn PDF document text
    • http://help-copyrighteamservice.com/buselipitisesozowevujagdf06j.pdfIn PDF document text
    • http://usmileofficial.site/championship_manager_java8588g.pdfIn PDF document text
    • https://dopizuledukure.weebly.com/uploads/1/3/2/3/132302960/8741141.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/divelatoxa/xixudetugozoduna.pdfIn PDF document text
    • https://s3.amazonaws.com/folexapurilowe/60466370590.pdfIn PDF document text
    • https://s3.amazonaws.com/bisiku/citroen_grand_c4_picasso_manual_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/vukusa/18768098929.pdfIn PDF document text
    • https://s3.amazonaws.com/midaguvimabof/19146668019.pdfIn PDF document text
    • https://s3.amazonaws.com/joterige/80997924476.pdfIn PDF document text
    • https://s3.amazonaws.com/megodipewukitoj/automation_studio_b_r_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/epson_adjustment_program_free_l380.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/zurosifusele.pdfIn PDF document text
    • https://s3.amazonaws.com/lofese/frostpunk_ark_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/baines_school_new_uniform.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_off0000ca95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA95 5208 bytes
SHA-256: 61d298863a6568d9c250acfacb65a2200062a461cb550453cbece759fd30bdfd
font_01_sfnt_off0000dc4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC4F 10728 bytes
SHA-256: 0bea36fa942e8a58b4744e30ec5a46eff2ff3a9281ce2f9a01d92d3677540878

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