Malicious PDF — malware analysis report

Static analysis result for SHA-256 3202004ad3c53bc0…

MALICIOUS

PDF

73.4 KB Created: 2021-05-31 08:19:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a9fb3279622a57b6ad84f4eb19a60d1a SHA-1: 739620356ab8700c22fe2524dce00b0a1575fcb5 SHA-256: 3202004ad3c53bc00ee9fad2757c8fd2fa5a2e27cfd646b6004e6ecf03c24306
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for link farms or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. The presence of embedded URLs and the document's structure suggest it is designed to redirect users to malicious sites like 'midufefew.ru' for further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://midufefew.ru/strik?utm_term=problemas+de+ecuaciones+1+bachillerato+resueltos PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388420/normal_5fc7e35e651db.pdfIn PDF document text
    • https://libizewixowu.weebly.com/uploads/1/3/4/4/134432873/7519129.pdfIn PDF document text
    • https://sepuzemafunud.weebly.com/uploads/1/3/4/5/134584668/2760951f2053.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422147/normal_5ff0be25db81b.pdfIn PDF document text
    • https://xaluromaw.weebly.com/uploads/1/3/4/8/134862284/ruwelinawuza-zajuvesu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443610/normal_600b9a66219c0.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/a43c5719-793c-4ef8-9db3-f09802d2fd21/advanced_financial_accounting_mcqs_with_answers_mcom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4db1419d-0501-40d8-88b2-74b0ae5b7cb9/how_to_read_the_bible_for_all_its_worth_4th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/064244b1-fb1c-46b4-b1c4-19884711cbd1/83406940949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb72c021-5a7a-4041-880e-ae59f777216b/72417155933.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4a7a960-90d4-4e2b-aaee-efbb33dc8b46/battletech_miniatures_catalyst.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/371da7dc-a9f8-4d74-9512-03d9eabe9d1e/kitchenaid_artisan_stand_mixer_repair.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8804b377-b441-4ac9-a8f7-af07cb3b5c87/89044614613.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/31bb47ca-88b3-4243-b544-9c311757fbe9/how_do_i_fix_my_android_stuck_on_startup_screen.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4184632-ca29-4d8f-8545-0525afcd3704/safety_performance_review_form.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a9969d4-48a0-4227-acef-9b6400f45c87/53436907355.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4502a90d-9bc8-40e3-9767-bd2478f1c3cf/namerezidut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f54ac24c-2153-4840-9f15-37fb9cc54e87/does_lexus_make_a_hybrid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6eb5a670-c309-4e9c-8403-85603541333c/nikon_prostaff_3-9x40_bdc_chart.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_off0000df3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF3B 5372 bytes
SHA-256: dc88660d405801e7861bd3c5123873d54b573a205abd9aeba28bc653a24b265f
font_01_sfnt_off0000f14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14B 11876 bytes
SHA-256: 60771ba70f447c89d90f023602cc24623e99c1ba2507a8c1277950a52437a926

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