Malicious PDF — malware analysis report

Static analysis result for SHA-256 d71515b47be6e84a…

MALICIOUS

PDF

71.7 KB Created: 2021-02-28 08:49:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d44831ecff83e369c3772ffa3229d5c8 SHA-1: 5600fb090bbc11c4fbb1b5e08a78f93002ec3669 SHA-256: d71515b47be6e84a4e7c31d36c513e6657b2efa20aec80454c8e3e47320f074a
126 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggest the document's primary purpose is to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://nipisod.ru/123?utm_term=go+tell+it+on+the+mountain+lyrics+pentatonix PDF link annotation
    • http://maykistore.ru/go_viral_digipowerjne44.pdfIn PDF document text
    • http://4gusevshop.website/forza_horizon_2_maphyo2y.pdfIn PDF document text
    • http://interbankdigital.com/xufisuratutomarikukigolor6mmno.pdfIn PDF document text
    • http://lasomupigo.iblogger.org/23635757782.pdfIn PDF document text
    • https://cdn.sqhk.co/guzelatolina/nAjjgdl/xijitabunilufis.pdfIn PDF document text
    • http://hookup755.fun/sakurolopipegovevisadi63bn.pdfIn PDF document text
    • https://vivexizakodol.weebly.com/uploads/1/3/1/4/131483194/jekevig-lopatolinaluz-turakonanov.pdfIn PDF document text
    • https://zemexiwum.weebly.com/uploads/1/3/4/3/134330210/xotuzelofinubapefo.pdfIn PDF document text
    • http://xbet1.fun/37427459505cqdr0.pdfIn PDF document text
    • http://dwatches.site/849827020196jf5j.pdfIn PDF document text
    • https://cdn.sqhk.co/wepurodapike/OICsgdI/2725779296.pdfIn PDF document text
    • https://gumabudisipinef.weebly.com/uploads/1/3/2/7/132712006/8361414.pdfIn PDF document text
    • https://cdn.sqhk.co/mamevugixej/U95ghjh/doxaji.pdfIn PDF document text
    • https://gurosutu.weebly.com/uploads/1/3/2/3/132303194/gigakugegegufe.pdfIn PDF document text
    • http://ecoservice-vlad.ru/kipotevigomekih1fnx.pdfIn PDF document text
    • http://ses-sanobrabotka.ru/wabiwafejoxodokazme2z.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/vufuzewasi/82150388861.pdfIn PDF document text
    • https://s3.amazonaws.com/vipuxafol/42404131808.pdfIn PDF document text
    • https://s3.amazonaws.com/dobikasukavu/47195444585.pdfIn PDF document text
    • https://s3.amazonaws.com/satulibaren/40230197169.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_off0000db6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB6E 5376 bytes
SHA-256: eeafe8b4b178d66a8c1a9dc6fa94871927152c719fdd79ca014ac5ee3b4061b9
font_01_sfnt_off0000ed92.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED92 10368 bytes
SHA-256: 8900f639cc7b4d21a78db94b9821a71b878f0ab395da0935fde15236e726d306

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