Malicious PDF — malware analysis report

Static analysis result for SHA-256 22a4daeb23a9a76a…

MALICIOUS

PDF

82.2 KB Created: 2021-03-31 06:35:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 469bdeb06098097fd76fb4dec80a8872 SHA-1: fb36e5ddc3c05fc485a1148db6fbeaf80c3bcc04 SHA-256: 22a4daeb23a9a76a8d63e4580c7e3b71170d90f0c22a958faf8febe6ffa4d5de
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/award?keyword=gap+year+affidavit+format+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4483602/normal_5fee9afadd287.pdfIn PDF document text
    • http://rejemezurufoveg.mywebcommunity.org/la_divina_comedia_quien_fue_el_autor.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482618/normal_5fd8236018339.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/nelusafelolekutaxojene.pdfIn PDF document text
    • http://zokugorevat.mywebcommunity.org/91571280144.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417308/normal_601ad357c3b52.pdfIn PDF document text
    • http://kefijor.mygamesonline.org/menace_d_accouchement_prmatur_traitement.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382643/normal_600f7b8e67c49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475720/normal_604d3e4e82e58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500665/normal_6007d3ec2dcad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417419/normal_60618541d4c05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://22e365c6-0853-42e1-82f8-83473bf9c0bf.filesusr.com/ugd/217d68_d13b95f38a184a76b9a939f6989bab97.pdf?index=trueIn PDF document text
    • https://71f68c9c-1037-483c-a0ca-f268b7ddd3c8.filesusr.com/ugd/87fdc7_138fc40b0a954cd1a790cb40d25e58eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xupimaral/gigegefobebimij.pdfIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_b130ff816baa4374b99f02a7ffd60550.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wutogugej/avent_microwave_sterilizer_vs._electric.pdfIn PDF document text
    • https://e20d271a-53e3-41f9-9180-d6cd5f9fd148.filesusr.com/ugd/6cfc61_eab2c82c852746c4995d2b90b6abbcbf.pdf?index=trueIn PDF document text
    • https://78905da9-dd21-4190-abaa-c894c042e703.filesusr.com/ugd/851c7c_700b2870d8f740f8943552c13287d766.pdf?index=trueIn PDF document text
    • http://gamelaluwer.myartsonline.com/succeed_in_cambridge_cae_10_practice_tests_key.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/safety_1st_grow_and_go_forward_facing_requirements.pdfIn PDF document text
    • https://ac3db616-04cb-40f1-8357-c67041f5e20c.filesusr.com/ugd/eda9ba_7b060c7476e5426ea7772555859ad87d.pdf?index=trueIn PDF document text
    • https://86b7bb9a-6a0b-496c-a062-e8aa60c365d0.filesusr.com/ugd/dcf311_1bcdd1cb877f42b38938f299d4161e5a.pdf?index=trueIn PDF document text
    • https://a1b876fd-e98f-4594-996d-fc523792ae9e.filesusr.com/ugd/efcbf0_b1f619a773f646059d4a1981877a8419.pdf?index=trueIn PDF document text
    • https://28546a20-d0cc-4b82-bb4f-6711990cd5a3.filesusr.com/ugd/0bcf16_e04f894cbb044af5b34018be20b2b564.pdf?index=trueIn 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_off0001065b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1065B 5172 bytes
SHA-256: eea99ce986fb0a2e9fc519f415ab9d9657145f3a1c2df596e627629a53151784
font_01_sfnt_off000117f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117F3 10436 bytes
SHA-256: 53b6812c69fca3832d906a9b61febfbc0a7ee40e7fa97f02a746404450404cb1