Malicious PDF — malware analysis report

Static analysis result for SHA-256 823792ac2fbb6b0c…

MALICIOUS

PDF

74.4 KB Created: 2021-03-18 14:31:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 68bc6b307261db90d71cd46fb48cce5f SHA-1: 3dd6258c169aa4e0b76763c77062f0648b2d61ec SHA-256: 823792ac2fbb6b0c5345793ecbe2d4332eba5ad4ba3af10f99e31c5b611216cf
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with a high concentration of them pointing to disposable domains or suspicious TLDs, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to a malicious site for further exploitation or credential harvesting. No scripts were extracted, but the PDF structure and URL distribution are indicative of a phishing lure.

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://ponafet.ru/strik?utm_term=how+to+know+the+bible+more PDF link annotation
    • http://jubisadamafav.22web.org/blueberry_og_grow_report.pdfIn PDF document text
    • http://atomyimperial.ru/96583044225nqyvg.pdfIn PDF document text
    • http://bufo.online/601719334190fdh9.pdfIn PDF document text
    • http://newowoliso.iblogger.org/levagexidaxuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4456166/normal_5ff4fd8496432.pdfIn PDF document text
    • http://rarinokuxe.iblogger.org/academische_vaardigheden_voor_interdisciplinaire_studies.pdfIn PDF document text
    • http://zudumawekal.22web.org/venture_capital_and_private_equity_a_casebook_5th_edition.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369316/normal_604dcf95421df.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/6221f713-d3c8-4517-9b20-4a255182d814/what_is_the_structure_of_nike.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4837638a-38f7-4fe5-9a90-5c081f8f800d/jafugalufam.pdfIn PDF document text
    • https://s3.amazonaws.com/telasebisu/25062639819.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c0373db-ef14-4991-aba7-84ee81dca1b7/how_to_renew_my_drivers_license_during_covid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88c5279f-f865-4299-81d6-1ff0d5e46829/how_to_set_up_voicemail_on_blu_android_phone.pdfIn PDF document text
    • https://s3.amazonaws.com/divelatoxa/castlevania_rondo_of_blood_ps4_guide.pdfIn PDF document text
    • http://gidetux.rf.gd/joxesorur.pdfIn PDF document text
    • http://mujijebal.epizy.com/82406491020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b46f8c2b-687d-4cd9-bdaf-96e5fdfc0c89/kedubasegutifuvape.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_off0000e724.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE724 4792 bytes
SHA-256: 950655d436e193895c23d9950cb08011d586df4771391c9cd9f959429fe3a2e3
font_01_sfnt_off0000f753.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF753 10856 bytes
SHA-256: dcf8c0506c8345cf33dff70094ef9a0523ffd7d8abb34b54edb6aa14a7453fe9

Open this report in the interactive analyzer, or submit your own file for analysis.