Malicious PDF — malware analysis report

Static analysis result for SHA-256 d9f334ae3ed745b0…

MALICIOUS

PDF

78.1 KB Created: 2021-04-18 05:11:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 7bd1d09f6485da1b17ccbc7349c21a74 SHA-1: 5a3810a495f992c8cd4f2b78d846534ccc7d9728 SHA-256: d9f334ae3ed745b0a9351ca0585a32a9be6b8bddd5019fcb221dbaf7bc026715
126 Risk Score

Malware Insights

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

The PDF contains embedded URLs and heuristics indicate it is a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a social engineering attack to trick users into visiting malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://pelibifir.ru/strik?utm_term=how+to+install+whatsapp+on+iphone+4s PDF link annotation
    • http://azakalaza3.xyz/fire_and_water_signsouxjk.pdfIn PDF document text
    • http://bcpzonasegura10beta-viabcp.com/vadumubamakukewisevawomf7xza.pdfIn PDF document text
    • https://cdn.sqhk.co/lexuxeza/gejbvKc/91717262495.pdfIn PDF document text
    • http://bitsracing.net/5078388848573xkh.pdfIn PDF document text
    • https://cdn.sqhk.co/pavoraxebute/eTRjfhd/youtube_music_download_app.pdfIn PDF document text
    • https://cdn.sqhk.co/fewoxenovof/iibl5jg/super_soccer_champs_2020_mod_apk_download.pdfIn PDF document text
    • https://cdn.sqhk.co/farafakilof/cADegfK/now_showing_movie_sign_template.pdfIn PDF document text
    • http://zamuxodub.22web.org/classic_wow_enchanting_leveling_guide.pdfIn PDF document text
    • http://italysummer.space/980983643084kmzg.pdfIn PDF document text
    • https://cdn.sqhk.co/zagusebipin/ibujhha/sonic_all_stars_racing_transformed_pc_key.pdfIn PDF document text
    • https://cdn.sqhk.co/zotenejek/gcQjgjf/come_creare_uno_sticker_per_instagram.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca43fa0c-2bae-4933-bbd6-bd7a89a43a49/circe_madeline_miller_age_rating.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc6dd466-5fea-4940-96b6-a36e1c30abb8/mibavipaworatumomarob.pdfIn PDF document text
    • https://f1fb087f-5d49-4061-aa02-230b108315d3.filesusr.com/ugd/645068_20533c9cf6624a7597a747398586d151.pdf?index=trueIn PDF document text
    • https://a513df27-8ea1-49e5-9b48-af726a3c99b5.filesusr.com/ugd/c567c1_8099907233b049a09de2b87839682991.pdf?index=trueIn PDF document text
    • https://156bb51f-0b62-477f-88ca-8620af00812b.filesusr.com/ugd/e3ff21_09a4461e98974190a82cb6a6c36d2ea5.pdf?index=trueIn PDF document text
    • http://jazupizewatabal.epizy.com/tipos_de_comunicacin_asertiva.pdfIn PDF document text
    • http://ritarejameja.epizy.com/xopalazegifinovejefesekam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa0bbe1c-db6f-4097-a2fe-29344d6c82f2/lodixedifexipoli.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9cbe8e69-e370-4406-ba68-50883dc99fd5/27350463873.pdfIn PDF document text
    • https://f26e6bca-ce10-4524-9610-ed5ef7c8d48b.filesusr.com/ugd/ac8c68_78e52ad71d434f0e95dd9eadb295a229.pdf?index=trueIn PDF document text
    • https://203e7bc3-08d7-4ecc-a8df-f797e0d4a079.filesusr.com/ugd/d4579c_74964a08055741abbb08b6c4809f1fa1.pdf?index=trueIn PDF document text
    • http://nagudakorixo.rf.gd/bedumur.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_off0000f53b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF53B 4952 bytes
SHA-256: 2a86edd8dc452fec4e162d0994e9ba52cf75fb717ba8f3065ae229fd081cde66
font_01_sfnt_off00010624.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10624 11032 bytes
SHA-256: c13768e641f8a2e1e977791bfb0bbbdecc400319a590c7a614891a0a2c3f3da1