Malicious PDF — malware analysis report

Static analysis result for SHA-256 58a54806a527aae9…

MALICIOUS

PDF

67.5 KB Created: 2021-02-13 06:51:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: 86491def5a3b428d616c45da07143856 SHA-1: eeb9ea132f71439daa10ee8de858ad7db13d39eb SHA-256: 58a54806a527aae99f8e243aaf437b7568c0bb92bc7f80a0808a8204006bec70
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/wb?keyword=convert%20url%20link%20to%20pdf%20online In PDF document text
    • https://static.s123-cdn-static.com/uploads/4454819/normal_5ff575d33d023.pdfIn PDF document text
    • https://cdn.sqhk.co/kawinojos/dUaLhfq/english_spanish_translator_offline_dictionary_download.pdfIn PDF document text
    • https://cdn.sqhk.co/surudije/ihjhhb8/downton_abbey_movie_now_playing_near_me.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458618/normal_5fd22e6c5ed0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497079/normal_5fcf526c55d47.pdfIn PDF document text
    • https://cdn.sqhk.co/migixurej/hgjbfPV/international_calls_nbn.pdfIn PDF document text
    • https://cdn.sqhk.co/visunexabore/jdghadg/ixl_learning_stock_price.pdfIn PDF document text
    • https://wixuzezokanozav.weebly.com/uploads/1/3/4/6/134663812/5d888bb41b8.pdfIn PDF document text
    • http://devicesprotectionforusers.site/86114907981wxlyd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368266/normal_6024128851452.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467287/normal_5fd640c0dbcac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489415/normal_60248799bc287.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418570/normal_5fd34fa8cbb7f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375070/normal_6010a72e34c74.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/vonutavekip/94523112591.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_off0000cbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBFB 4676 bytes
SHA-256: 7f0a3693c8d8719eed7583b1853814194c621f93c4666678a51a65a470e1c8ce
font_01_sfnt_off0000dbfd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFD 10924 bytes
SHA-256: ea9851508261cbb227f9a741a87b98e49ea682bfd55fcd30a7b27e857a748c34