Malicious PDF — malware analysis report

Static analysis result for SHA-256 85065aef91c50e6d…

MALICIOUS

PDF

77.3 KB Created: 2021-05-04 23:52:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 8c077da9bf02c0f315cd5ef3c19d50e2 SHA-1: 201ae3fb89af0caa184ee6415a06ddd80e9b1050 SHA-256: 85065aef91c50e6d2b297bd8805a1390be3798ce6ce0ae1fa8e1f100a61d52a0
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was identified as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains a large number of external links, many pointing to disposable hosting services, suggesting a link farm designed to redirect users to potentially malicious content. The primary URL, https://pelibifir.ru/strik, is likely part of this redirection scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://pelibifir.ru/strik?utm_term=tankless+water+heater+kit+home+depot PDF link annotation
    • https://refodalisa.weebly.com/uploads/1/3/4/4/134437853/9932478.pdfIn PDF document text
    • https://feronokemafa.weebly.com/uploads/1/3/1/1/131164109/56c85d297543a47.pdfIn PDF document text
    • https://bijepete.weebly.com/uploads/1/3/4/3/134378827/293775.pdfIn PDF document text
    • http://vexidizagopukib.22web.org/23313395684.pdfIn PDF document text
    • http://somukegizos.66ghz.com/nezeratowejanofuxif.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jodojan.epizy.com/john_deere_riding_mower_service_manual.pdfIn PDF document text
    • https://a0f88182-e1f9-4a9c-ba22-d5ce004c6985.filesusr.com/ugd/2f3216_405297186a424d71b9237e9c96df553d.pdf?index=trueIn PDF document text
    • https://e19809cf-df80-48c1-9975-8599b001ad7a.filesusr.com/ugd/062cdf_3da2b0dc2dde4b0c8a17c1a6268b2442.pdf?index=trueIn PDF document text
    • http://gelulunex.epizy.com/kurikag.pdfIn PDF document text
    • https://s3.amazonaws.com/jenisozazewubo/giparibuwi.pdfIn PDF document text
    • http://refowokewip.rf.gd/manual_audifonos_beats_studio_wireless.pdfIn PDF document text
    • http://wupewujivijulo.epizy.com/vobuwesopavunowanobupiziw.pdfIn PDF document text
    • https://s3.amazonaws.com/jedadokuti/mevikilovafufinak.pdfIn PDF document text
    • https://165abacb-5525-4e66-971c-c167d859e756.filesusr.com/ugd/f3f2a5_a2e1c2bae6814feab2ce2c965d5ed358.pdf?index=trueIn PDF document text
    • http://sawokinajiralar.rf.gd/marvel_contest_of_champions_ios.pdfIn PDF document text
    • https://s3.amazonaws.com/bifamomove/fulewakebolotofemefex.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/ti-nspire_cx_ii_software_download.pdfIn PDF document text
    • http://fanugisenok.epizy.com/63056120824.pdfIn PDF document text
    • https://fb4bdcd3-28a3-4206-a6c3-fb267f511c23.filesusr.com/ugd/0ad562_0fbc2c7f08c94cae963fed2d1db45531.pdf?index=trueIn PDF document text
    • http://mixaluzosibad.rf.gd/tixaxurifufivos.pdfIn PDF document text
    • https://af1bea64-f5cd-41c2-a7c1-97f21c1aa057.filesusr.com/ugd/592671_35778468885347ea87db6598ed76090f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dudujopixejikug/14851664010.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_off0000f01e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01E 5304 bytes
SHA-256: c5224dd77ad90cf129ddfbdd7b002881edcd54bec751791c8c6a4afb5cb9dbc3
font_01_sfnt_off0001020f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020F 11084 bytes
SHA-256: 4c67e24d816bcae36857dfa743c8155f619a6c80b0c74616636107302f08c6f0

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