Malicious PDF — malware analysis report

Static analysis result for SHA-256 c81302a2631c41fe…

MALICIOUS

PDF

60.5 KB Created: 2021-02-07 23:13:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: df75f32c8b9c34a8df8d3f0acd2345e6 SHA-1: 7233d93e66b04e83186b6c346eb2dd11ac860d5c SHA-256: c81302a2631c41fef1e0182d3b33727319ea2d8e50bf59a72d8ab6048810b966
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://yafferge.ru/123?utm_term=asko+dishwasher+manual+d5536 In PDF document text
    • http://2220202.ru/zeiss_ikon_nettar_1231_163j21h.pdfIn PDF document text
    • http://udilische.club/sawaxobanesikenapita3xno2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402267/normal_600bc5358021e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456135/normal_60039a9ac32ff.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366050/normal_5fcc3a2b2724b.pdfIn PDF document text
    • https://tejukikefuxod.weebly.com/uploads/1/3/4/7/134703803/6604235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393772/normal_5ff456dd7fadb.pdfIn PDF document text
    • http://6gusevshop.website/gujaxijilixedqza6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408599/normal_600383bcb8d29.pdfIn PDF document text
    • https://nokesopupikes.weebly.com/uploads/1/3/4/7/134767934/nufex_wevinidadugin_vivujalagis_popejoduliwav.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/zazelujeju/88383559136.pdfIn PDF document text
    • https://s3.amazonaws.com/vapite/38273646883.pdfIn PDF document text
    • https://s3.amazonaws.com/muwemivumazulax/46322688191.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/bhangra_gidha_full_hd_video_song.pdfIn PDF document text
    • https://s3.amazonaws.com/buxoparadazegu/an_inspector_calls_responsibility_quotes.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_off0000b2cd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2CD 5652 bytes
SHA-256: 3f6ee565ce026ad1506007b72b4d5b7087325d30e51ac879bf237d87e40a3cc1
font_01_sfnt_off0000c5ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC5EE 9280 bytes
SHA-256: 5e0c2f515767bce2d0623848e9e870cd2585af453f2ba0a67e58d2a5410d7494

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