Malicious PDF — malware analysis report

Static analysis result for SHA-256 44546dfc078a813b…

MALICIOUS

PDF

79.0 KB Created: 2021-04-05 09:03:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 339ef0b0d188cba90d122e52853dd540 SHA-1: 5b405ac8dbc6f7c9b359a04c541bc4ae584a2697 SHA-256: 44546dfc078a813bbeae51fca03c464b328856cf166655d7e40d1bf2e74aab23
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/award?keyword=autonomous+car+research+paper+pdf PDF link annotation
    • http://zufonedisogaj.iblogger.org/50373815720.pdfIn PDF document text
    • http://kofodotig.sportsontheweb.net/major_scales_treble_clef.pdfIn PDF document text
    • http://sizerasadaxer.mywebcommunity.org/rotik.pdfIn PDF document text
    • http://nubolats.xyz/945169409425tu8v.pdfIn PDF document text
    • http://mitutepoka.medianewsonline.com/74362483794.pdfIn PDF document text
    • http://tufataf.22web.org/nataguvuvewizofitowetolap.pdfIn PDF document text
    • http://copyrightram.net/4762755107477llr.pdfIn PDF document text
    • http://itrom.fun/4_conceptos_de_contabilidad_y_sus_autoresw5avz.pdfIn PDF document text
    • http://zoxuruje.sportsontheweb.net/monuzob.pdfIn PDF document text
    • http://diwabivis.22web.org/royalty_accounting_journal_entries.pdfIn PDF document text
    • http://detonic-official.website/83796152435bi42h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jokuletufale.epizy.com/lamoxowojawemo.pdfIn PDF document text
    • http://gepivefukusi.atwebpages.com/pebobasusomezafedax.pdfIn PDF document text
    • http://wafalox.rf.gd/721012786.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb126f1-e997-43a2-afa7-5ab573d843a7/prince_caspian_book_setting.pdfIn PDF document text
    • http://fonimegalidoxu.epizy.com/ebay_dropshipping_guide_with_no_inventory.pdfIn PDF document text
    • http://dimizisunope.epizy.com/amplictil_ampola_bula.pdfIn PDF document text
    • http://sedekebokavid.rf.gd/59476537146.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e13bde30-1e87-4d06-b8f6-a37ec9f71d33/tipos_de_comunicacion_linguistica_y_no_linguistica_ejemplos.pdfIn PDF document text
    • http://takerowul.epizy.com/new_bollywood_movie_2019_hd.pdfIn PDF document text
    • http://vabanenutulaki.rf.gd/ganekejamegadinowobe.pdfIn PDF document text
    • http://puligop.epizy.com/55207540529.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_off0000f744.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF744 5352 bytes
SHA-256: 83c4377a843b18890063651a44083525d73901f502355f56518843abb8cc1397
font_01_sfnt_off0001094f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1094F 10916 bytes
SHA-256: 0b8f8bc3f58fe5d1165bcd427a45caaa9396519fd55887018245ff23983ef90b

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