Malicious PDF — malware analysis report

Static analysis result for SHA-256 94158b61d1e57aab…

MALICIOUS

PDF

103.3 KB Created: 2021-03-08 15:09:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 8542d05453f08fc51086c1cca9f43e83 SHA-1: 521a0d38c953aceef19c404a43257b0efa247eb3 SHA-256: 94158b61d1e57aab2d5db720bf4815429995bedc7ec758c144eea133ed8ee584
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9997

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://bologen.ru/wix?keyword=ode+on+a+grecian+urn+summary+in+tamil PDF link annotation
    • http://trysoda.club/26773911384mcp0c.pdfIn PDF document text
    • http://sipataj.sportsontheweb.net/fafupux.pdfIn PDF document text
    • http://theandyhong.com/control_of_electrical_drives_leonhardht8p9.pdfIn PDF document text
    • http://vowufijetapiko.sportsontheweb.net/how_to_invest_in_indian_stock_market_from_canada.pdfIn PDF document text
    • http://interplast.ru/save_the_light_steven_universe_apk36t5p.pdfIn PDF document text
    • http://antonioit.fun/instant_followers_pro_apknrnvj.pdfIn PDF document text
    • https://cdn.sqhk.co/mixenezir/fyghick/zemaxajamosunefa.pdfIn PDF document text
    • https://cdn.sqhk.co/tekemozuj/gciagfH/74666541024.pdfIn PDF document text
    • http://pl50off.info/goldschmidt_2019_abstract_templateuya05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c02dad88-6456-4ece-bced-868386630509/jimujoduxubirod.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b4ad24e4-c8ea-4ad0-a77f-c14c62df5841/73129496807.pdfIn PDF document text
    • https://s3.amazonaws.com/rodiligarexo/sigokijigogifibotexe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d180354-0cf1-4633-8bc1-e0cf57b86d44/best_dental_light_cure_machine.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e8ff44c-b060-42e8-b299-c5dd0beaa4e5/limixepowatutibedesi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd98d123-a1ec-4de6-b264-fd533ef7a429/fezivipokifinutuv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6404e9f-b398-4af8-ba98-61a302b52061/34989584023.pdfIn PDF document text
    • https://s3.amazonaws.com/niporofez/churake_dil_mera_lyrics_song.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a1e42e7a-49f8-42a2-b9c9-1d0025a18059/nirideko.pdfIn PDF document text
    • https://s3.amazonaws.com/mexesazaxasa/cambridge_english_proficiency_masterclass.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5cc5a4b-f909-4f2b-9022-18a0a21a8923/how_to_stop_knee_pain_while_sleeping.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_off00015a51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15A51 5388 bytes
SHA-256: 8e3cea30212d75b7638cdad392e221d1f64cdbae37f3f15028069d6c336a8449
font_01_sfnt_off00016c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16C91 10240 bytes
SHA-256: b75d18a03622259f4ba40d71c72ef4b444b1e99d4b792766bdf881d80bc4ec54

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