Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6380c96fd0007cd…

MALICIOUS

PDF

83.8 KB Created: 2021-04-21 19:05:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 70f004b780293491dcb0638171bb47c5 SHA-1: 91934f0d4872482b59ce7d7769d41b266b7c550a SHA-256: c6380c96fd0007cdd43d7ae9d5a76400cc22dcf8cc3528713fd9cc73b40b6117
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports that this PDF is part of a link farm designed to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jumiwimov.ru/strik?utm_term=yamaha+dgx+650+midi+out PDF link annotation
    • https://gakatonigi.weebly.com/uploads/1/3/2/6/132681340/fenedevawim-ratewuguviseto.pdfIn PDF document text
    • https://bugevokugado.weebly.com/uploads/1/3/4/8/134870551/boviperosogide.pdfIn PDF document text
    • http://instapodarok365.site/intro_to_psychology_rutgers12iak.pdfIn PDF document text
    • http://sis-paypal.com/98482459664jl69r.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/48075282353.pdfIn PDF document text
    • https://bifukumuvu.weebly.com/uploads/1/3/5/3/135347201/zogot.pdfIn PDF document text
    • http://livifobin.22web.org/pathophysiology_of_acute_lymphoblastic_leukemia.pdfIn PDF document text
    • http://websporizlehd.com/cuantos_tipos_de_sistemas_politicos_existennogum.pdfIn PDF document text
    • http://mandarin-fruit.space/achilles_tendon_physical_therapy_exercisesvw1yj.pdfIn PDF document text
    • http://fejugutafilevin.scienceontheweb.net/ipad_pencil_annotate.pdfIn PDF document text
    • http://xewunozapuzezok.iblogger.org/renetuze.pdfIn PDF document text
    • http://idealica-italiauficiale.website/format_of_two_column_cash_book0rni4.pdfIn PDF document text
    • http://fomizedo.iblogger.org/nikoxalamowadiziw.pdfIn PDF document text
    • http://jadogaxarabu.mygamesonline.org/58972340587.pdfIn PDF document text
    • https://wupanotowi.weebly.com/uploads/1/3/1/4/131406855/4cee3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/latufenaw/vejevorizoritid.pdfIn PDF document text
    • http://jobuzabibapopo.epizy.com/12427688977.pdfIn PDF document text
    • http://mujunuge.rf.gd/english_test_a1.pdfIn PDF document text
    • https://s3.amazonaws.com/bubisifapagefe/irrigation_definition.pdfIn PDF document text
    • https://s3.amazonaws.com/savifin/kivofu.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_off00010725.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10725 5380 bytes
SHA-256: 74d039278bbd443c4c2e5e1c9ca20a63f97e05d04b91d6c6028b2b3dc56e2fc6
font_01_sfnt_off0001195a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1195A 11908 bytes
SHA-256: b1d90682597ff9b1ab607d14b68e2c553c3642985f1058f4a5852a274a23dccf

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