Malicious PDF — malware analysis report

Static analysis result for SHA-256 b8bec08fd09298c6…

MALICIOUS

PDF

79.9 KB Created: 2021-03-13 16:28:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 755a59920dbeb412dfb2edb87e1019b0 SHA-1: 81df137ff6b42ce558f4f7b98c2078638e81bc75 SHA-256: b8bec08fd09298c60db6c803e6752c1a749ce61f038fc01fc01ef39c919ceb25
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a phishing or malware distribution campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a phishing site disguised as a help page. The presence of external URIs and link farm characteristics further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://midufefew.ru/aws?utm_term=what+does+it+mean+when+your+washer+says+f PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417534/normal_5fcc5f4d726b3.pdfIn PDF document text
    • http://vzruvayarttraff.xyz/47931927367a1da0.pdfIn PDF document text
    • http://krokoboko6.xyz/how_to_clean_ink_cartridge_hp_photosmart_7520hn8k2.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/aW2jcgh/nafatumab.pdfIn PDF document text
    • https://cdn.sqhk.co/noviraxat/MJiegeS/6771561805.pdfIn PDF document text
    • https://cdn.sqhk.co/kolusugego/3jbhggw/86501282377.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367656/normal_5ffec179e58d3.pdfIn PDF document text
    • http://vertigoa.online/welakazufazuzalaxonaw6d.pdfIn PDF document text
    • https://cdn.sqhk.co/zakikola/5tighc1/baneveraxujevowuma.pdfIn PDF document text
    • http://d2-club.ru/874102845113v49d.pdfIn PDF document text
    • https://cdn.sqhk.co/gejupajo/jdhjArg/amc_ahmedabad_corona_positive_list_today.pdfIn PDF document text
    • http://presalon.xyz/69357389279adj7a.pdfIn PDF document text
    • https://cdn.sqhk.co/fovulifavu/gcHhcPX/amazon_used_women_s_golf_clubs.pdfIn PDF document text
    • http://pefiworawodud.mypressonline.com/fujifilm_xp70_review.pdfIn PDF document text
    • http://dugarudewemudo.sportsontheweb.net/jepesodipes.pdfIn PDF document text
    • http://xifasiv.getenjoyment.net/convert_kindle_to_online_free.pdfIn PDF document text
    • http://xunopapazugatar.medianewsonline.com/como_sacar_la_molaridad_de_una_solucion_acuosa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366666/normal_5fca45b7073c0.pdfIn PDF document text
    • https://cdn.sqhk.co/xorilulog/fLhibjj/xozot.pdfIn PDF document text
    • http://goossyy.online/ark_breeding_mutations_guideii6em.pdfIn PDF document text
    • http://ketrovk.xyz/kewokojaverikiwelaimktd.pdfIn PDF document text
    • http://fakts.design/60984410208lx1iq.pdfIn PDF document text
    • https://cdn.sqhk.co/fupupusamun/iggfhiK/22667661781.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pojozija.onlinewebshop.net/6-6_skills_practice_trapezoids_and_kites_answers_with_work.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_off0000f9ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9FF 5320 bytes
SHA-256: dee71c7546418fd1dbd54e8975ad7fbfb22838cd2aa0b50bbf8d29700de5726e
font_01_sfnt_off00010c09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C09 11200 bytes
SHA-256: d00a552e7a235c5ad30335ce91f976e9acf07e7c829ee5475cd147785b46f5b0

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