Malicious PDF — malware analysis report

Static analysis result for SHA-256 061f9dc47708acd0…

MALICIOUS

PDF

76.8 KB Created: 2021-06-10 02:28:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8d427519a802b7d529577e156a683d99 SHA-1: 055f5243d7d9eb5a09ef3c6105c087a99d58b812 SHA-256: 061f9dc47708acd0851e70951ca39d181a6065f95a08ffe7da065fda1e4aa8db
134 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. The document contains numerous embedded URLs, including one pointing to 'coretry.ru', which likely serves as a lure for downloading a malicious application. The presence of a 'download button' heuristic further supports the phishing pretext.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://coretry.ru/pbw?utm_term=v380+pro+app+download+for+laptop PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497131/normal_604fa2f5dd446.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366033/normal_604cf96d645a3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365580/normal_604bb7db27ac5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403270/normal_60241fa6c923d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5feb2f1c4b8bc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382190/normal_601748bc110e1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387810/normal_60148b8569660.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374951/normal_6049f0e05fa12.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416302/normal_604e6308272f8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450158/normal_5fdbff47cacac.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xawaren.pbworks.com/f/nuclear_chemistry_review_worksheet_answers__50____Low__1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/47585847-30a9-452b-a024-e428b6affc14/33067733803.pdfIn PDF document text
    • http://joxupakager.pbworks.com/f/duwelivonekagawosesupa.pdfIn PDF document text
    • http://wodupabizel.pbworks.com/f/77419251166.pdfIn PDF document text
    • http://muzurinugaw.pbworks.com/f/tedej.pdfIn PDF document text
    • http://kobowal.pbworks.com/w/file/fetch/144900150/idle_heroes_cd_key_november_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0cbe0984-c635-4240-9312-86dadab0f7c5/banizu.pdfIn PDF document text
    • http://zufiwuz.pbworks.com/w/file/fetch/144657660/how_to_program_comcast_remote_to_control_tv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93098067-50d7-4e03-ac27-cb64e1939f76/how_to_play_chess_video_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d5744996-37a9-475f-9e06-ed3afa49ad81/58581842996.pdfIn PDF document text
    • http://xizalow.pbworks.com/f/20458878419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc33a76e-0cdb-4426-a41e-290dc0f40631/taditufe.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_off0000ef38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF38 5416 bytes
SHA-256: b840a6bf267c5c3a0796750d701b91252d7aae623332923f798b84d83d05bfe0
font_01_sfnt_off000101ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101CE 10664 bytes
SHA-256: cd716a214a97d309ac4532f08bd0068f48283b9ab50ee686683c8b71e5201078

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