Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b9b48887aee28a1…

MALICIOUS

PDF

130.6 KB Created: 2021-05-27 07:15:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 9b59b9b1f82d0a098451bc1ebc611bcb SHA-1: 910235546de713f0e15200694d624aa0b2808080 SHA-256: 4b9b48887aee28a11f1804ec994f243a48a3fea5509d0fd16c016f1118e07687
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, a common tactic for phishing or distributing malware. The ClamAV detection and ML classifier strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and numerous external links suggest it's designed to redirect users to potentially harmful websites.

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://xajibur.ru/strik?utm_term=texas+rangers+all+you+can+eat+tickets PDF link annotation
    • https://jewumuseporefi.weebly.com/uploads/1/3/4/5/134599703/7846402.pdfIn PDF document text
    • https://denowulak.weebly.com/uploads/1/3/3/9/133997299/risawonirezuve_minamuba_voxujovos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454825/normal_6056adc3e9c80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373782/normal_5ff352e0cec57.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422147/normal_5ff0bee6c7aa9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485173/normal_603ebef44d958.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410199/normal_60066897a58f4.pdfIn PDF document text
    • https://poxanada.weebly.com/uploads/1/3/1/4/131483305/wogetizoridevaf_nopaki.pdfIn PDF document text
    • https://juxilejaguzu.weebly.com/uploads/1/3/4/4/134404551/86b440016fc761.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469860/normal_602b3735dde60.pdfIn PDF document text
    • https://napolodakuziman.weebly.com/uploads/1/3/0/7/130775867/173433.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488335/normal_60297df783aef.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403407/normal_5ffa23f42d894.pdfIn PDF document text
    • https://dixonojobu.weebly.com/uploads/1/3/3/9/133997274/wipisifufeg_pusalukemago_vogusigadaka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390643/normal_5fe00d15f41ed.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/535eac70-74c9-4652-ace7-c26270256f9d/04_dodge_ram_1500_fuel_pump_relay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2e49b972-5da7-499f-84e8-a57819e04d31/understanding_calculus_ii_problems_solutions_and_tips.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bd34d76-abf8-42f9-a08e-8afaebf7a129/where_is_the_best_place_to_buy_a_roomba.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d45954be-5739-4514-aaa5-e83bb89eb592/how_to_train_for_a_half_ironman_triathlon.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_off0001c600.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1C600 5148 bytes
SHA-256: ad4769c35243b798a8c50274ad1dd531676e654b73a80795be9a517d7379f22a
font_01_sfnt_off0001d7a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1D7A6 11004 bytes
SHA-256: 238c7dce30593fefb746bd31832f8e077cad1c8fa8b947d32a6a9d6dfaad7a4b

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