Malicious PDF — malware analysis report

Static analysis result for SHA-256 91f41698039c2f6c…

MALICIOUS

PDF

70.1 KB Created: 2020-12-23 17:41:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: bec0e2a42b2d4c43094e3fa96f97e686 SHA-1: c0fe93a773274a6afea827d4eeadaac4fb5d6269 SHA-256: 91f41698039c2f6c9472d8c643c4fd83d0ac1c16ff34da304f6a045e0f21cc1d
254 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a link farm designed to redirect users to malicious infrastructure, specifically identified by the URL `https://traffking.ru/strik?utm_term=finals+bracket+2019`. The document's content and structure strongly suggest a phishing or scam attempt, leveraging a "Finals bracket 2019" lure to entice clicks. The presence of numerous embedded links, many pointing to external PDF files, indicates a coordinated effort to distribute malicious content or lead users to phishing sites.

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://traffking.ru/strik?utm_term=finals+bracket+2019 In PDF document text
    • https://vazoxavaver.weebly.com/uploads/1/3/4/8/134863882/5011865.pdfIn PDF document text
    • https://cdn.sqhk.co/dudazume/AgghiNl/wefubisuviviroter.pdfIn PDF document text
    • https://bizetuxerupa.weebly.com/uploads/1/3/0/8/130873791/6241819.pdfIn PDF document text
    • https://gokopawe.weebly.com/uploads/1/3/4/4/134493337/voxexinelosiremejas.pdfIn PDF document text
    • https://cdn.sqhk.co/gogoturowib/RIY4fYR/tinopifabenexazekakijatu.pdfIn PDF document text
    • https://cdn.sqhk.co/tesinogopano/InX8Vji/7013224782.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwisagilevi/ghhdjig/27304120697.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/bulikowexunepov/fomobikawat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6b747f32-06ad-47b8-a477-b37e30623869/80954263219.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97207855-ee8d-4cb2-af40-425851967f1c/quadro_o_inferno_de_dante_botticelli.pdfIn PDF document text
    • https://s3.amazonaws.com/bokelur/mapobafefafiwetirafo.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d24b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD24B 5432 bytes
SHA-256: c10822a03f31551551abcc93e0ec939b6d72e093fc777f6d3e31b429e90ed1cb
font_01_sfnt_off0000e4d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4D4 12132 bytes
SHA-256: 45e00de5bf9772a4e68df4b9f004427a77372099444dfefbca925650e5602bbd

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