Malicious PDF — malware analysis report

Static analysis result for SHA-256 69c2b3cf4a2320f0…

MALICIOUS

PDF

69.1 KB Created: 2021-05-29 21:44:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-01
MD5: 9dc86669c8b26d662773771f919cc468 SHA-1: 92756f129479b2aa395fc6c127ce7fb981814e8e SHA-256: 69c2b3cf4a2320f062832b30eb440156632e1e62abfe08e0c06c31c974d0d2a0
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 0.9998

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://midufefew.ru/123?utm_term=oxford+phonics+world+readers+level+1+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4500189/normal_60319ab884a7a.pdfIn PDF document text
    • https://lerelapukuvi.weebly.com/uploads/1/3/0/7/130740054/9559721.pdfIn PDF document text
    • https://pasironukid.weebly.com/uploads/1/3/0/8/130814081/7f1cf5da6a17ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426971/normal_5fd07653dd400.pdfIn PDF document text
    • https://kowojifab.weebly.com/uploads/1/3/4/6/134622532/249489c50ef965a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_5fe7839dbfd82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458625/normal_606ce27fca45b.pdfIn PDF document text
    • https://tazipapanora.weebly.com/uploads/1/3/0/7/130776418/2517144.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4458633/normal_5fce7076cd4f4.pdfIn PDF document text
    • https://govubazidexifa.weebly.com/uploads/1/3/4/3/134342639/c3654cff9cc67.pdfIn PDF document text
    • https://mobinefoju.weebly.com/uploads/1/3/1/3/131398425/netibunavej-wajojufix-vikidu-gabikeriduza.pdfIn PDF document text
    • https://gupasozulo.weebly.com/uploads/1/3/4/4/134471060/5043268.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476122/normal_6006d5474dbe5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447089/normal_5feb62c912074.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/8e8839e3-0556-4b76-8552-3f8d1a37e434/24732275544.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1532136d-fa7c-4d7f-90cf-751853ce049b/52390467016.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/897e1348-64b5-4b82-a501-6a64386b57e3/buzepigesoxakiwi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbd2a472-5f02-4302-b55e-1c31c3e093a3/38984078685.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_off0000d07c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD07C 5540 bytes
SHA-256: b8b01d866edfc89fad452b6603e6ff674d3aef5c19c43970f482f77787a80478
font_01_sfnt_off0000e376.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE376 10384 bytes
SHA-256: 72bcb31e6dd700cc1c32719bdc6ffa512d19407a5c33b48e86d3b85b6e429b48

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