Malicious PDF — malware analysis report

Static analysis result for SHA-256 5cd77398ccf0a3fb…

MALICIOUS

PDF

112.6 KB Created: 2021-03-27 19:09:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: c3f176d9942b34756752d5d37f4f8e60 SHA-1: 96a4f6b6a67c43df1ed6f4ae8fc1bf49bf477922 SHA-256: 5cd77398ccf0a3fbaaff6bb360692fd68452594adaeba9bce8221caff09a6384
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://maypoin.ru/strik?utm_term=what+are+universal+human+needs PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4502493/normal_60523cba555df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421352/normal_604370ef17dc5.pdfIn PDF document text
    • https://cdn.sqhk.co/tajiwikiter/3AaZgjq/mesedojukinizizilixulijor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426688/normal_601b32d29c06c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366664/normal_60244c28498bb.pdfIn PDF document text
    • https://cdn.sqhk.co/gizoxemovefi/58jhyjb/52102597880.pdfIn PDF document text
    • https://cdn.sqhk.co/gisopagipize/jcXDUgf/61555028826.pdfIn PDF document text
    • http://zutalinezar.iblogger.org/allluia_magnificat.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4487916/normal_5fdf05b81c00d.pdfIn PDF document text
    • http://berezarivire.iblogger.org/86814253812.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385021/normal_60199ccc92d04.pdfIn PDF document text
    • https://cdn.sqhk.co/duzixulok/cgfhbL8/move_whatsapp_to_sd_card_samsung_j5.pdfIn PDF document text
    • https://cdn.sqhk.co/meradipuwiz/lMnFYBT/xewanofifo.pdfIn PDF document text
    • https://cdn.sqhk.co/bupewazadufa/F1BgipB/download_music_on_mp3_player_free_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://musarozopod.rf.gd/sosapunavapamami.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/64fe5a15-7808-49fc-a2e8-5b9a0723cda9/setavavinoledaxux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70fca526-74ef-4365-a93c-20003e801579/26856961317.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d299dde2-fd9f-462f-904b-a6bf42e1413a/76008793253.pdfIn PDF document text
    • http://wedexad.rf.gd/time_dilation_theory.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_off00017d56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D56 5140 bytes
SHA-256: d736380d02d67b496dae9db7ff8fe7e5e52ca2a6e163db5c831cc724b01d629b
font_01_sfnt_off00018eb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18EB1 11556 bytes
SHA-256: 9988862bdaa26428138da45d61eab7cf25e8d6c1d7afbb9cfc489a6fec72f020

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