Malicious PDF — malware analysis report

Static analysis result for SHA-256 da747c0ef3bc466c…

MALICIOUS

PDF

77.7 KB Created: 2021-04-14 21:27:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: f2a753417492bdc69c0ae4210ad00d85 SHA-1: 512442ebd86afb51eac94f6aad7db80fc04915e3 SHA-256: da747c0ef3bc466cbe1592aeb583d4ce79ce7a4e586be935678d7a8948cf9487
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is detected as malicious by ClamAV and an ML classifier. The embedded URL 'https://mezovuduw.ru/strik?utm_term=what+setting+on+a+stove+is+300+degrees' suggests a lure to a potentially malicious site. The presence of PDF_SEO_LINK_FARM heuristic indicates a large number of outbound links, typical of SEO spam or phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://mezovuduw.ru/strik?utm_term=what+setting+on+a+stove+is+300+degrees PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4490365/normal_600446912c16b.pdfIn PDF document text
    • https://cdn.sqhk.co/tuturuno/LgcAKJz/dosofevusedivorelepaxo.pdfIn PDF document text
    • http://merovew.xyz/gukusixizevegobanamojyjdsh.pdfIn PDF document text
    • https://cdn.sqhk.co/gukituzaju/hiy185U/vujufelerusi.pdfIn PDF document text
    • https://cdn.sqhk.co/kugefiruxat/qgejcc2/smashbox_bb_cream_light_medium.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/jhJhehg/file_manager_for_iphone_download.pdfIn PDF document text
    • https://ruxibotululag.weebly.com/uploads/1/3/1/4/131408142/gedigusaris.pdfIn PDF document text
    • http://byt-upak.ru/60055280528am98g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384323/normal_60513f8381836.pdfIn PDF document text
    • http://tehnotop.space/21114139458fjocu.pdfIn PDF document text
    • https://cdn.sqhk.co/nepodowu/bgig8ib/business_day_calendar_2021.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406464/normal_60522b79df3ee.pdfIn PDF document text
    • http://itchia.space/capacitor_across_transformerhd355.pdfIn PDF document text
    • http://tryici.xyz/dark_souls_3_4_lordsnnrrd.pdfIn PDF document text
    • https://mogopefisumiba.weebly.com/uploads/1/3/5/2/135295831/vuvawegadokewanep.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/jitimesolagun/aashiqui_2_all_song_masstamilan.pdfIn PDF document text
    • https://s3.amazonaws.com/mujesogi/lorivapimow.pdfIn PDF document text
    • https://s3.amazonaws.com/vobuturinivi/acrylic_sheet_suppliers_in_indore.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/topaninuza.pdfIn PDF document text
    • https://s3.amazonaws.com/kugelilizibuwum/sewobewofumefowi.pdfIn PDF document text
    • https://s3.amazonaws.com/tiluwisulepam/florida_notary_acknowledgement_form.pdfIn PDF document text
    • https://s3.amazonaws.com/xulikamul/half_blood_prince_film_cast.pdfIn PDF document text
    • https://s3.amazonaws.com/legenapi/rerosesevarimeriziwilo.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/dibiwasesidaliluro.pdfIn PDF document text
    • https://s3.amazonaws.com/zuponefi/beneficiary_ira_distribution_form.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_off0000ef53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF53 5432 bytes
SHA-256: 36bb6687348cf6d729129c9d97bfa59594e7d6c5d85f0800762f33ea329d923c
font_01_sfnt_off000101d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D6 10956 bytes
SHA-256: bb0793b6a094bfdfa5835e0e0287589cc841cab0fc3fe6c5517df6492d79a76e

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