Malicious PDF — malware analysis report

Static analysis result for SHA-256 728c4bffa1c69c94…

MALICIOUS

PDF

68.3 KB Created: 2021-02-20 15:04:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 90edb14933efae1def90ea4a88e094f5 SHA-1: 8e40372ad1d035a5f9ac1c1b9f4667feeaadf530 SHA-256: 728c4bffa1c69c94cbd034826dbbd757e276038b87456b7e6d77b0d84b471ac2
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/wix?keyword=algebra+1+regents+june+2017+answer+key In PDF document text
    • https://cdn.sqhk.co/jupujezaxa/mjc57ii/37866914273.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420752/normal_60184bb1444cb.pdfIn PDF document text
    • https://cdn.sqhk.co/xekemini/hhjh1z2/zefagijejasu.pdfIn PDF document text
    • http://pirizatifi.iblogger.org/best_bollywood_movies_sites_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/zenekukera/gcVieig/14976341804.pdfIn PDF document text
    • http://sowaviwexurejo.22web.org/vexexalexasewagu.pdfIn PDF document text
    • https://tunegize.weebly.com/uploads/1/3/4/5/134500295/d6fe04f.pdfIn PDF document text
    • https://cdn.sqhk.co/vemegunir/jaifgi7/spaceflight_simulator_rocket_blueprints_download.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/hMnjaje/capstar_for_dogs_walmart.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/redegelesibif/bichhoo_movie_song_bestwap.pdfIn PDF document text
    • https://s3.amazonaws.com/jusuberu/gozebopoxokuzelupez.pdfIn PDF document text
    • https://s3.amazonaws.com/mejigavukolu/69082531350.pdfIn PDF document text
    • https://s3.amazonaws.com/sumesawoxajew/subajorelimofidowasidetig.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_off0000cc0d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC0D 5724 bytes
SHA-256: f64c881b13821fe2fdfe5e244f726e9a33933b883d981f9a9b015c3ea16ba180
font_01_sfnt_off0000dfc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC3 10720 bytes
SHA-256: 947e4abff29cad126fa876ac06a35356bcb8782999f2e8f29b8f5a2d3d315c42