Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4b21d5aff2a82ed…

MALICIOUS

PDF

72.1 KB Created: 2021-03-02 07:40:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: 95a398d8415a1be6ab4b688226e60361 SHA-1: e8f058beedf88d059fb110ae53a4c809234a177e SHA-256: c4b21d5aff2a82ed0b25f5510c197ccac307df5d6509ebc117e7268007d87715
254 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/award?keyword=is+the+sun+man+made In PDF document text
    • https://volorizog.weebly.com/uploads/1/3/1/0/131070051/5074597.pdfIn PDF document text
    • https://tigidejuremu.weebly.com/uploads/1/3/4/5/134502839/fuvajuliv-noxidir-zaluzev.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479715/normal_5fe32d5a7dc5f.pdfIn PDF document text
    • http://azorocheat6.xyz/15759125754kwef6.pdfIn PDF document text
    • http://aycotoro7.xyz/dapisazagenijewitekcavwo.pdfIn PDF document text
    • https://vugogirofezufus.weebly.com/uploads/1/3/4/3/134355312/petedigawu.pdfIn PDF document text
    • http://topvideo.design/best_bubble_milk_tea_flavorsb48o3.pdfIn PDF document text
    • http://keepmaxi.space/tiwuditawov7px9t.pdfIn PDF document text
    • http://goodnaturak.space/mathematics_tricks_questions_with_answersui5rq.pdfIn PDF document text
    • https://tuzebomutiwok.weebly.com/uploads/1/3/1/3/131398369/146a9d7a81de04.pdfIn PDF document text
    • https://wewogubebomev.weebly.com/uploads/1/3/4/6/134692169/6982870.pdfIn PDF document text
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/jelumawegiwoxub.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/sepovutapakogaf/lurufatomil.pdfIn PDF document text
    • https://s3.amazonaws.com/belapawerezuju/call_boy_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/papuja/rudazazolabobi.pdfIn PDF document text
    • https://s3.amazonaws.com/pafiganovavi/autocad_plant_3d_brochure.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_off0000dec9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEC9 4872 bytes
SHA-256: f21aebadd516c4f7061afef9156c331847b3c747fdecee4e833311b3d3f54e40
font_01_sfnt_off0000ef2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF2C 10928 bytes
SHA-256: 9edfc11f0d30cbdecfc941216e9e344c692b9e43a97b3024d79bccbafc12c910

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