Malicious PDF — malware analysis report

Static analysis result for SHA-256 05424ef242daff44…

MALICIOUS

PDF

67.6 KB Created: 2021-02-22 11:06:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 872b3ef5d8af7c132d34e5edabf9b31f SHA-1: 138e3bd6585b95620d30275b63d899b73750ba2c SHA-256: 05424ef242daff44e879a6dea71668e1d78e7de2357ee46a4dc759d56e7e1dc0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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.
  • 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://leonvi.ru/123?utm_term=taotao+50cc+atv+plastics PDF link annotation
    • https://cdn.sqhk.co/lojosexotak/nZjgggu/gatokokakuworebejifuxali.pdfIn PDF document text
    • https://wurivebufe.weebly.com/uploads/1/3/0/8/130874680/zologevof.pdfIn PDF document text
    • https://cdn.sqhk.co/tosolizidovi/Boxgc8g/cartoon_video_maker_application_download.pdfIn PDF document text
    • http://jewlgems.com/922219818342gbti.pdfIn PDF document text
    • http://esclub.info/org_chart_template_word_freee07ul.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/gf8hehc/baby_growth_chart_by_month_lbs.pdfIn PDF document text
    • https://cdn.sqhk.co/verexumifo/Ohja3hi/best_piano_app_for_pc.pdfIn PDF document text
    • https://debamivuk.weebly.com/uploads/1/3/1/8/131871977/6374100.pdfIn PDF document text
    • https://cdn.sqhk.co/mepapogivoma/ggie9jh/64721767276.pdfIn PDF document text
    • https://cdn.sqhk.co/tatogevi/iKE0UAh/26708328138.pdfIn PDF document text
    • https://digagewopaloz.weebly.com/uploads/1/3/4/6/134634746/b0022c6.pdfIn PDF document text
    • https://gawosiluzetur.weebly.com/uploads/1/3/4/6/134631715/2767514.pdfIn PDF document text
    • https://cdn.sqhk.co/zozusexub/pgf2id3/suzudolu.pdfIn PDF document text
    • https://cdn.sqhk.co/razanifuwuz/xgjjgja/smart_switch_vs_at_t_mobile_transfer.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/sazixipame/13717334407.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/anemia_ferropenica_definicion.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_off0000cbf8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCBF8 5108 bytes
SHA-256: f82305f94971dc344ca3549c379f484683bacbc72976157e641e36699200a645
font_01_sfnt_off0000dd78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD78 10608 bytes
SHA-256: b8becb440a03597f4fe815b708b40bce3ba707c8a8415623b36f7fd87812354a

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