Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2b73b9b7c3035ef…

MALICIOUS

PDF

73.9 KB Created: 2021-05-22 10:42:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 694bd4ef38ac6f46b8a75edb9f160838 SHA-1: 1e58882fa6d1345e8efdb5ca87c9a50544fc4453 SHA-256: c2b73b9b7c3035efc7836fc304c98ea7fcef7185136af0d7ab1c56bff8ca5023
154 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support its malicious nature. Although no scripts were explicitly extracted, the PDF structure and embedded URL suggest an attempt to redirect the user to a malicious site, likely for phishing or to download a secondary payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 4

  • 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.
  • 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/wb?keyword=armstrong%20air%20furnace In PDF document text
    • https://cdn-cms.f-static.net/uploads/4459631/normal_6038594a2e826.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381544/normal_60343c854e435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421623/normal_601672417591f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446651/normal_600e87e94a681.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377120/normal_60060f41aa79d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479705/normal_5fc69c6f5cb36.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464850/normal_6047bb7ff3572.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471691/normal_5fe9d5a4c8be8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491965/normal_60661e1408167.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/30da166f-1fe1-4170-8dcd-0af7de1b3265/samsung_ce0168_tablet_does_not_turn_on.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4f155d6e-b83d-4899-aa95-952a890d4124/xelikezejunotopezimizagi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a40994f9-69be-40d0-ad6c-f03deaeafd28/the_book_of_martha_sparknotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a11bea17-b557-4a54-b3b9-8e4dc0053588/konekorawupavizuwodem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cebce3cd-4889-4eb6-a79f-fa29c3e1ce40/leguneroweza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c98fad6d-36f3-4d9e-9f46-2c02a9d3307a/why_is_my_kitchen_faucet_leaking_at_the_base.pdfIn PDF document text
    • https://s3.amazonaws.com/sixenogafopoj/nutrition_an_applied_approach_5th_edition_ebook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11bdc2ff-bc08-4d55-aa32-d748ebce6787/29433307779.pdfIn PDF document text
    • https://s3.amazonaws.com/limepusotanal/free_fortnite_skins_pc.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df6a1a2e-9ffb-4d5d-b515-7ae905306439/what_is_the_meaning_of_adjectives_and_examples.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/32324cc2-afef-4b9c-8bac-009a7d7c0bfb/libro_felder_balance_de_materia_y_energia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e196153-60c1-48dc-8521-464af3c2398d/turobigibixosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc9d016f-0ffe-43d6-b2c1-fdd4d03b8de4/85996030594.pdfIn PDF document text
    • https://s3.amazonaws.com/pokixovuxik/havoc_demon_hunter_guide.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_off0000e2f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F1 5156 bytes
SHA-256: 57e3e330353c3a38466ccdc8ce98196a1975898a90d4d3cab60f59cf2cfd2fd4
font_01_sfnt_off0000f46a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF46A 11208 bytes
SHA-256: 795416df2e34dc73b9b72a9bef3f7cc81f2a60204469d3f85bf4ed2020db8e4e