Malicious PDF — malware analysis report

Static analysis result for SHA-256 846c55ab21ab19fa…

MALICIOUS

PDF

81.0 KB Created: 2021-05-06 21:12:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: a36c5f6e3217633fcdaec430bec3cd1f SHA-1: d58be35919fe9c12fd2c3b17ed9410b62cf0a09d SHA-256: 846c55ab21ab19fa9b86ecbb7a0d7404d90b8ccfcec5d138237a82f7c9df6a88
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it functions as a link farm, embedding numerous external URLs, with one prominent URL being `https://ponafet.ru/strik?utm_term=special+theory+of+relativity+easy+explanation`. This suggests the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://ponafet.ru/strik?utm_term=special+theory+of+relativity+easy+explanation PDF link annotation
    • https://ziwoleraxen.weebly.com/uploads/1/3/4/3/134385658/mosaxogexowediwog.pdfIn PDF document text
    • https://ziloboze.weebly.com/uploads/1/3/2/6/132683463/mulolu.pdfIn PDF document text
    • https://tibomomaludo.weebly.com/uploads/1/3/0/9/130969572/vuputedifol.pdfIn PDF document text
    • https://milonotupilo.weebly.com/uploads/1/3/5/3/135347339/5099536.pdfIn PDF document text
    • https://koxizekeb.weebly.com/uploads/1/3/4/7/134770308/ditulir-bowabuwutu.pdfIn PDF document text
    • https://ragedoxe.weebly.com/uploads/1/3/0/8/130873846/ee45026a.pdfIn PDF document text
    • http://nolonumufowarob.iblogger.org/online_flip_book_maker.pdfIn PDF document text
    • https://kixumiziri.weebly.com/uploads/1/3/2/6/132681985/2940419.pdfIn PDF document text
    • http://zarozunaxa.iblogger.org/channels_tv_apk.pdfIn PDF document text
    • https://mukafakurud.weebly.com/uploads/1/3/4/3/134315218/bomurafa.pdfIn PDF document text
    • https://jivarogogujuno.weebly.com/uploads/1/3/4/5/134513891/394cdf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_abaced50f6ea45c79446fdf98efe8d67.pdf?index=trueIn PDF document text
    • http://forawoxo.epizy.com/82181807606.pdfIn PDF document text
    • https://7a1f2a0d-094a-4466-88af-72a4af93b9fa.filesusr.com/ugd/22739b_bb092e19c7a04f5ea7ff2c1e4bd4e85f.pdf?index=trueIn PDF document text
    • http://niforubuduxema.epizy.com/vibemuxokemupusamexuxi.pdfIn PDF document text
    • http://fojofediwesifog.rf.gd/precise_and_concise_language_worksheet.pdfIn PDF document text
    • http://jinesiwi.epizy.com/19500116297.pdfIn PDF document text
    • https://cb8582fb-ab29-4f13-bfd4-623ca244ab52.filesusr.com/ugd/d61b30_6b023a27531b4b86bedf7364f86a21b9.pdf?index=trueIn PDF document text
    • http://sozazibelafi.rf.gd/xomiparogofimefazelik.pdfIn PDF document text
    • http://toberijalija.rf.gd/celebration_hymnal_for_everyone.pdfIn PDF document text
    • https://601bead5-a720-4f65-98db-62fe2a42cb91.filesusr.com/ugd/0e52b4_66a54c1b9816453ba1481ecce61ccf24.pdf?index=trueIn PDF document text
    • https://411be8f8-4ba1-40b5-9edf-cc4a2c3d5ecc.filesusr.com/ugd/a86d68_b0cc0e8b4719439fa34094ada5504bbd.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_off0000ff70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF70 5436 bytes
SHA-256: a975a8c2e83d838aa18513bf6007713474f6eadf5d46a606b8ef6f5c144c18d5
font_01_sfnt_off000111fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111FB 10632 bytes
SHA-256: 86a633d8239c23e065fb595c500d41453b1814eae118b647b58cdf54e0957e68