Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1e3e50d68a2d557…

MALICIOUS

PDF

78.5 KB Created: 2021-04-30 12:59:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 7b011c818f220b018035cbf1b4992a8c SHA-1: 0875acbdef45138ddea47c2d425ff079e9c1fc09 SHA-256: a1e3e50d68a2d55794ef4c35f9cbfd7bb4a4a58fdbc8eefc3bcdda0cac634087
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including ClamAV and an ML classifier. It contains a large number of external links, many pointing to SEO-optimized PDFs, suggesting a link farm or phishing lure. One prominent URL, 'https://resalured.ru/strik?utm_term=que+tiene+asociado+en+ingles', appears to be a redirector for free-download phishing. No scripts were extracted, but the PDF structure itself facilitates the redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://resalured.ru/strik?utm_term=que+tiene+asociado+en+ingles PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383444/normal_5feb8085f2b0c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453108/normal_600615b530072.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411708/normal_5ffc58d21c87c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482020/normal_60590edb657fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474445/normal_6011cceef008f.pdfIn PDF document text
    • http://wowunoli.22web.org/bonukezobapoxekife.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428038/normal_600fbb0498676.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470985/normal_60239c6024ccb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4448986/normal_5fc665602576d.pdfIn PDF document text
    • http://help-business-media.com/tu_me_quieres_blanca_alfonsina_storni_analisisi9n4r.pdfIn PDF document text
    • http://richteam.site/542172113547sxwp.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426424/normal_5fcc821200967.pdfIn PDF document text
    • http://tokio-2020.fun/wosomop93f81.pdfIn PDF document text
    • http://datingsexchat.site/formula_para_el_area_y_volumen_de_un_cilindrovm74o.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450003/normal_603b143465374.pdfIn PDF document text
    • http://tinubawolu.mywebcommunity.org/508_bus_schedule_nj_transit.pdfIn PDF document text
    • http://vesajob.getenjoyment.net/pronunciation_problems_in_english.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://eb40363d-1d1f-4170-a897-f23f0f433116.filesusr.com/ugd/2a1429_faed97ed7e61426ca46d46a16ad5ab43.pdf?index=trueIn PDF document text
    • https://6131fb9f-3080-406c-a6ab-c4686b6a2f6f.filesusr.com/ugd/52be6f_fd44dd1bbb1945de94a2779e38201503.pdf?index=trueIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_f111d33c8b574368a53f64b102a2de5f.pdf?index=trueIn PDF document text
    • https://748e6e98-33e2-4bd1-95aa-01ea3505a154.filesusr.com/ugd/704f6c_08f38b81871844f6978ebdae10ca40a8.pdf?index=trueIn PDF document text
    • https://c1f973cf-d719-4acb-8f9e-cd83ae4fb94d.filesusr.com/ugd/057766_5951a3569e2d4600b0019a9537250839.pdf?index=trueIn PDF document text
    • http://nanixigininu.rf.gd/35862867990.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC98 5072 bytes
SHA-256: 9461ec92e1c50c3859abc6ef62826e7f8559bf6a4c77bf98c5343483642eb953
font_01_sfnt_off0000ede7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE7 12012 bytes
SHA-256: affd33eb651ea2739f45f95882e297b8c3f74a4900d16f7a2bd5390919dfbefe
font_02_sfnt_off00011580.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11580 16172 bytes
SHA-256: 640e3a5b7acba8388c316acb3b7aac4b5c8a8d362b79fad7ae873e4778668a5f

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