Malicious PDF — malware analysis report

Static analysis result for SHA-256 a0f529c4a8a2e151…

MALICIOUS

PDF

80.9 KB Created: 2021-03-17 11:49:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d2ff7cac8f53a8a2b94dc35489b7a2e8 SHA-1: bdc9304725cabae76435b8b613713e85e22bc873 SHA-256: a0f529c4a8a2e15166fdf84fecfe69ebf675f761c4541153a7bd0cab3261f18d
244 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded links, many of which point to disposable hosting services and redirectors. One critical heuristic indicates that the PDF links to known malicious redirector infrastructure, specifically mentioning 'dafemum.ru'. The ML classifier and ClamAV also flagged this file as malicious, suggesting a phishing or trojan distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://dafemum.ru/strik?utm_term=ipods+have+bluetooth+capability In PDF document text
    • https://sobexezawatu.weebly.com/uploads/1/3/4/9/134903145/594f8e7.pdfIn PDF document text
    • https://vizejuvevu.weebly.com/uploads/1/3/2/6/132681979/lasapobuzinakade.pdfIn PDF document text
    • https://nokafixawawi.weebly.com/uploads/1/3/1/6/131606940/9554505.pdfIn PDF document text
    • http://olymp-trade.top/fekanepibavifekanixodi9bi33.pdfIn PDF document text
    • https://nabaladeso.weebly.com/uploads/1/3/1/4/131438379/5812523.pdfIn PDF document text
    • https://nodepuje.weebly.com/uploads/1/3/4/5/134518199/tafodetov.pdfIn PDF document text
    • https://cdn.sqhk.co/teposodigar/jcDBFdn/wumozeg.pdfIn PDF document text
    • http://hurricane1.space/garrett_and_grisham_biochemistry94s02.pdfIn PDF document text
    • https://kaneloko.weebly.com/uploads/1/3/1/4/131408798/buzisomidupug.pdfIn PDF document text
    • https://didunomupipopad.weebly.com/uploads/1/3/1/4/131438203/famazejax-zabawovajen-rijadili-lerur.pdfIn PDF document text
    • https://cdn.sqhk.co/bepeguvovori/OdQjgjb/3_day_notice_to_vacate_california_template.pdfIn PDF document text
    • https://cdn.sqhk.co/wubunepan/a2kD1a3/98845879207.pdfIn PDF document text
    • https://cdn.sqhk.co/labifikup/jaiLHQ1/wallpaper_iphone_12_pro_max_4k.pdfIn PDF document text
    • http://normal-id.com/calling_the_shots5n0r1.pdfIn PDF document text
    • https://moxitamun.weebly.com/uploads/1/3/4/0/134040854/kaxita.pdfIn PDF document text
    • https://mimevomakiket.weebly.com/uploads/1/3/4/6/134693464/likefumax_sizetifewagadev.pdfIn PDF document text
    • https://jamojibo.weebly.com/uploads/1/3/5/3/135349767/sofipifitawi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6b5d12f1-3bbc-48af-9ddb-5430d2fe15e7.filesusr.com/ugd/3bf302_a97c03123818407fb15ee8130cf57ee0.pdf?index=trueIn PDF document text
    • https://f72b89be-0fa6-41ee-8162-331329ef78ce.filesusr.com/ugd/95089d_2490034f52ac43c784660d6ef1051dd3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/medaliwifufugel/frequency_table_worksheet_gcse.pdfIn PDF document text
    • https://s3.amazonaws.com/mejawiwomak/penikomalulone.pdfIn PDF document text
    • https://s3.amazonaws.com/jefobexapulow/gitez.pdfIn PDF document text
    • https://s3.amazonaws.com/negonanopix/top_secret_recipes.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f593.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF593 5304 bytes
SHA-256: aeeac4ab474f018443ec430db8a2628c56f47a772f7ed0972ca4ab945322a82b
font_01_sfnt_off0001079b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1079B 1800 bytes
SHA-256: a36eee06fef6ce219692c4ec918276ac99413e4fd1e3666e4031624f9289d620
font_02_sfnt_off00011028.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11028 10988 bytes
SHA-256: aa484d33cd179b99df5bc033ad340f695f2d31eb69eb30892b538171d1472f3b