Malicious PDF — malware analysis report

Static analysis result for SHA-256 3383c682c2d80740…

MALICIOUS

PDF

68.1 KB Created: 2021-05-15 02:54:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b4931ddcd59d538ee5b2f2664daaa634 SHA-1: 227511a3a1aba81f90e6b73c2e9dd6e0a207306b SHA-256: 3383c682c2d80740d07c063ae30655a686d3b7dd2c8c7137fe7a57f1b3d41e8a
196 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains numerous external links, with a prominent heuristic indicating a link farm and SEO redirector. The primary malicious URL identified is 'https://fokemale.ru/strik?utm_term=why+is+333+a+holy+number', which is likely used to redirect users to a malicious site. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware delivery.

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://fokemale.ru/strik?utm_term=why+is+333+a+holy+number PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4460247/normal_5fe23ddd7776b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486054/normal_5fe56d46d38f6.pdfIn PDF document text
    • http://tedusoxunola.22web.org/legal_disclaimer_form_template.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454665/normal_606b6ee224eac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4384144/normal_5ff1af724f129.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414153/normal_605f55d9aec03.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413835/normal_6026974d48bad.pdfIn PDF document text
    • http://wetuferat.iblogger.org/betty_crocker_cookbook_1950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_6053ecbf9d8e9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4412378/normal_5fde13402e102.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459794/normal_5fe5d9282239b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4531626/normal_6067948a08a9d.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/genedesowul/jopupeligipopadinewira.pdfIn PDF document text
    • https://s3.amazonaws.com/winumigutam/vietnamese_dong_to_usd_cheat_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/arvind_ltd_annual_report_2017.pdfIn PDF document text
    • http://ruzoguniwu.epizy.com/37493029258.pdfIn PDF document text
    • https://5fa60de5-32ab-41ac-ba65-77330e21e623.filesusr.com/ugd/2e16aa_f32e2a1d36c84debb0d5cef939a28fa8.pdf?index=trueIn PDF document text
    • https://b8e64ff8-a522-4625-8e91-70fe47930cb2.filesusr.com/ugd/37987b_8621875286ab4ce78f3faf5c68cf0339.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/divikufifir/wildgame_cloak_14_pro_reviews.pdfIn PDF document text
    • https://s3.amazonaws.com/jivuxo/kingdom_come_deliverance_mightier_than_the_sword_latin.pdfIn PDF document text
    • https://5a20c861-23fd-468b-888e-078c5342874f.filesusr.com/ugd/924841_f89fddbb896c44d48e302cf9cb411dfe.pdf?index=trueIn PDF document text
    • https://9d50af6f-dbf7-41ba-b854-83985329a12b.filesusr.com/ugd/33c377_495cc8a45b0c40d9b6f1c8f2e04b42ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dobesogum/67002044999.pdfIn PDF document text
    • https://0ea1ff7f-05b3-43a2-9744-178351a05ed1.filesusr.com/ugd/01f9b9_83e030acbcd741d7b752c8da8db60611.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vatakefojunib/rorerufofoberegur.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_off0000d073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD073 5344 bytes
SHA-256: 266ffc0ceda99f9948d2e74f354b601e4099420aaa55d8ce50b545d6be5dec69
font_01_sfnt_off0000e281.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE281 9388 bytes
SHA-256: 5c867a9256c3e291b1bbadc8eb08f30d9f9c20c5fd3660fe00e61bfb8092eb8a

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