Malicious PDF — malware analysis report

Static analysis result for SHA-256 db42f458b913478d…

MALICIOUS

PDF

77.0 KB Created: 2021-03-04 11:07:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 98334e8ded5ab3006c70f97855a2b5ff SHA-1: 964b8f7410731ad8316f596bc7a6e3e4d82a0609 SHA-256: db42f458b913478d7ce8fdf03bff848766585eae21859d3c3c8a2cfeddbc4c8d
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://seumenha.ru/123?utm_term=game+on+2020+cast PDF link annotation
    • http://pokezokebawi.mygamesonline.org/how_to_replace_a_poulan_chainsaw_oil_pump.pdfIn PDF document text
    • https://cdn.sqhk.co/surikuzezun/ieidohj/35736864044.pdfIn PDF document text
    • https://cdn.sqhk.co/wugunifikezu/iaiihcp/38635054900.pdfIn PDF document text
    • https://zoxopabetil.weebly.com/uploads/1/3/1/1/131163737/jugevuromuf.pdfIn PDF document text
    • https://rixexumig.weebly.com/uploads/1/3/2/6/132681576/635222.pdfIn PDF document text
    • http://basiditdcf.space/percy_jackson_sea_of_monsters_trailer_in_hindiezeul.pdfIn PDF document text
    • https://cdn.sqhk.co/kevekelobivo/Hjhjjhe/broken_bones_lyrics_roger_waters.pdfIn PDF document text
    • https://cdn.sqhk.co/bofozuto/gchjgiW/hitman_marrakesh_sniper_assassin_professional.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/what_is_social_art.pdfIn PDF document text
    • http://garanibukumom.scienceontheweb.net/fenuvinafedovori.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/fXsmvPG/bot_machine_learning_algorithms_from_scratch.pdfIn PDF document text
    • http://mritzoliver.design/shimano_altus_sl-_m310_manual3kh6w.pdfIn PDF document text
    • http://nazhivy.net/503070768527cxey.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/belapawerezuju/airplay_ipad_2.pdfIn PDF document text
    • https://s3.amazonaws.com/sedowedi/dexatorasub.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e617.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE617 2940 bytes
SHA-256: b1a9ff6ba35dc6afe0897100fc92f3f1f3234f8fbf85b49142f1f5db2d57e62f
font_01_sfnt_off0000f0a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0A3 5124 bytes
SHA-256: f3966d5a6b14e3213d1407e8b0dfb206e10bcfd58746199ecbb639dc6478d482
font_02_sfnt_off00010200.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10200 10576 bytes
SHA-256: efd2344e0d6e31754bac7c6b1538ac60ae110e7bfe469503a02a27dcaa91931f

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