Malicious PDF — malware analysis report

Static analysis result for SHA-256 8e5607a97a921bc3…

MALICIOUS

PDF

78.4 KB Created: 2021-04-04 02:41:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 31686f3eb18bc27106fa3fa619f57c69 SHA-1: b13de346df831c12e7b7a86dde6f5fb95bb684d9 SHA-256: 8e5607a97a921bc34604a152a0de5740e19c3542f8ecf71ea3561c564cafe217
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains or Weebly hosting, indicative of a link farm. ClamAV detected this as Pdf.Phishing.Trojan, and ML classification strongly suggests maliciousness. The primary purpose appears to be SEO manipulation or distributing links to potentially malicious content, rather than direct execution within the PDF itself.

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://xajibur.ru/award?keyword=asnt+ut+level+2+questions+and+answers+pdf PDF link annotation
    • https://kixasakuzejud.weebly.com/uploads/1/3/5/3/135347884/0398f837429ead.pdfIn PDF document text
    • http://pollsexpert.com/2895877907900x6e.pdfIn PDF document text
    • http://firstdoctor.xyz/chain_reaction_game_show_2020s00bw.pdfIn PDF document text
    • https://gofolepoxi.weebly.com/uploads/1/3/4/8/134882907/wezogijisa.pdfIn PDF document text
    • http://tixshopclub.space/i_command_my_hands_lyricsxgyso.pdfIn PDF document text
    • https://nanijufofif.weebly.com/uploads/1/3/3/9/133999758/rodowodama.pdfIn PDF document text
    • http://localdesign.me/tukototizadoge1n6t3.pdfIn PDF document text
    • https://napifilimikap.weebly.com/uploads/1/3/1/6/131606974/9832163.pdfIn PDF document text
    • http://lovelyhouse.online/aircare_humidifier_cleaning_instructionsftzc8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://144ece88-722e-4d59-a9d1-ae16887514c2.filesusr.com/ugd/48b17f_61a3d2f94a954c12809648f6362f636d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nafibanefexex/toro_personal_pace_mower.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0abc9956-1f56-4f5d-898f-9196e67d835f/45581425928.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e719866-be93-446d-979d-f79d74c0f287/netgear_wgr614v9_setup_as_repeater.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/masozepiroxiruvofeb.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/jenn_air_gas_electric_grill_range_with_convection_oven_manual.pdfIn PDF document text
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_f4c4d3e377db4002a5d1a178eeb40b74.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d58b5c9-dae0-4f49-828f-605045680ab6/93956352043.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ba8dd6fd-ff4a-417c-b6cb-8e81bef0762e/24954503726.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_off0000f416.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF416 5432 bytes
SHA-256: 2ee2196d579510904869099548c34db8b7f1d8d51c27612014ec5cc7f45deac1
font_01_sfnt_off000106b7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106B7 11040 bytes
SHA-256: 6c5f19cf56f1ff9711912fa45f0132d1d483605a02e49982b41164693c00943d

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