Malicious PDF — malware analysis report

Static analysis result for SHA-256 591517e6294c7bfc…

MALICIOUS

PDF

64.9 KB Created: 2021-02-16 21:00:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 35a8865c322170f31a7c72be6dbbcb2b SHA-1: 0e1d785e3ed7571de1d42b9d1a3cef90fedfbe17 SHA-256: 591517e6294c7bfc41e856b917863cd3d16023b82e28d1e2878a3ddbe4a822be
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating maliciousness. It contains numerous external URLs, many hosted on disposable domains or link farms, suggesting a phishing or malware distribution attempt. The presence of embedded URLs and the overall structure point towards an attempt to trick users into accessing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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://jottigo.ru/strik?utm_term=libro+de+historia+de+mexico+1+telebachillerato+pdf PDF link annotation
    • https://cdn.sqhk.co/pigujoxexate/jeyhc3w/gokarosiru.pdfIn PDF document text
    • http://tiwikif.22web.org/ffxiv_ultima_weapon_ultimate_guide.pdfIn PDF document text
    • http://dedanafimek.iblogger.org/all_in_one_toolbox_pro_premium_apk.pdfIn PDF document text
    • http://good-production20.site/16911400239qo64v.pdfIn PDF document text
    • http://nasamipow.22web.org/rijojesikiwemej.pdfIn PDF document text
    • http://lnstagramsecurity.net/burma_tv_731l62.pdfIn PDF document text
    • https://xosufovopoxom.weebly.com/uploads/1/3/5/2/135298930/gurumibevafusoxu.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/HakfgiX/maludiwizivepuz.pdfIn PDF document text
    • http://instapriz.site/gta_san_andreas_apk_aptoide_ioso46iq.pdfIn PDF document text
    • https://cdn.sqhk.co/togareguko/wKihhbs/itarget_pro_app_review.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fujexineduronas.rf.gd/kanazematexuzuvor.pdfIn PDF document text
    • https://s3.amazonaws.com/zesotat/30255371829.pdfIn PDF document text
    • http://sakolizel.rf.gd/75013293607.pdfIn PDF document text
    • https://s3.amazonaws.com/xonaxevetaf/47702033548.pdfIn PDF document text
    • https://s3.amazonaws.com/luropi/movegida.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/lelud.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_off0000c1c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1C7 5596 bytes
SHA-256: 801eb5faebe81d378b3453c42220c88fb1bedc479e7cedab31d51c06ae7c6ad0
font_01_sfnt_off0000d4ad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD4AD 10420 bytes
SHA-256: fafc22b0450dc429c34283c60b475617c90a6721c4af10631cb9bcc0dcabf48b

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