Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6ce8b22f108415d…

MALICIOUS

PDF

78.5 KB Created: 2021-05-16 00:05:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-23
MD5: ba5e298e1ff4c9b5d59acfaa875dfa9d SHA-1: 80e1fb1dab2992b0bbd6f7570f0b66081e6ae8e1 SHA-256: a6ce8b22f108415d1a3a7cf71322650e6edea13c927d365f94352d687c9f1eca
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded links, many of which point to disposable hosting domains and are associated with a link farm heuristic. The primary malicious URL identified is 'https://midufefew.ru/strik?utm_term=best+fundamental+analysis+course+in+india', which is likely used to redirect users to a phishing or malware distribution site. The ML classifier and ClamAV detection strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://midufefew.ru/strik?utm_term=best+fundamental+analysis+course+in+india PDF link annotation
    • https://vujewixijul.weebly.com/uploads/1/3/1/4/131437312/xalamewize_wusekazesibefa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495391/normal_5fd350ee25580.pdfIn PDF document text
    • http://good-production17.site/476508841847mksm.pdfIn PDF document text
    • http://all-system7.xyz/65861712336zsoo7.pdfIn PDF document text
    • http://habirovradik.ru/ceridian_dayforce_app9wfeh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459468/normal_602472d7adbc1.pdfIn PDF document text
    • https://nuguviroguzemek.weebly.com/uploads/1/3/1/0/131070089/2c75936.pdfIn PDF document text
    • http://mamajan.space/birthday_cake_images_name_iqraq2394.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4505096/normal_6010de513d8e7.pdfIn PDF document text
    • https://rufukowov.weebly.com/uploads/1/3/4/6/134665675/dufizotoxopuduwu.pdfIn PDF document text
    • https://bezugoro.weebly.com/uploads/1/3/4/6/134697972/9631418.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tuvadovu.rf.gd/super_mario_bros_2_underground_theme_remix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/696dcd2f-7a74-42b8-851b-ab75f9d7a1d4/black_and_decker_grass_hog_edger_trimmer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b3157363-9176-4d8b-bc7e-734eb9e6e61c/hoja_de_vida_ejemplos_perfil.pdfIn PDF document text
    • https://4868a29a-6d77-448d-a9c5-bc5c6a1713c3.filesusr.com/ugd/060e50_27db7e9e23c44103a48488627ba7d3da.pdf?index=trueIn PDF document text
    • https://1ebfeea1-7d02-43b8-8f0a-002c87bc7f75.filesusr.com/ugd/50dcf6_4f031bcf7bfe4dc28ace7e2ab53267b2.pdf?index=trueIn PDF document text
    • http://gepopimasirepav.rf.gd/september_2020_telugu_calendar.pdfIn PDF document text
    • http://pudedenos.epizy.com/sapomigajuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0454658d-4b06-4b81-8aac-fe640c25a975/what_is_the_role_of_media_in_our_society_and_politics.pdfIn PDF document text
    • http://zobotidagulipu.epizy.com/principles_of_helicopter_aerodynamics_leishman.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_off0000f502.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF502 5316 bytes
SHA-256: 01365df3e527217374a16628600ea43ae1e9444cc17a12a95033f15d2b8459d4
font_01_sfnt_off00010710.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10710 10440 bytes
SHA-256: f251bdefab923eaf8d058b2be66507559be3c8a8351d0db1d07f8b453b751df5

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