Malicious PDF — malware analysis report

Static analysis result for SHA-256 bbbf7640278a73b4…

MALICIOUS

PDF

72.0 KB Created: 2021-05-04 08:43:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cd10a2c1c2c69aa483871ef352db1a50 SHA-1: ed1b95c1dc75a4138d5c548e7a50f01258bb6d5d SHA-256: bbbf7640278a73b40358b3a521cb403dc1e4c31b1fdc377683a1df9e630a4815
126 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and heuristics indicate it is a link farm designed to redirect users. The primary malicious URL, 'https://xajibur.ru/strik?utm_term=how+to+rescan+rca+digital+converter+box', is likely part of a phishing or scam campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

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://xajibur.ru/strik?utm_term=how+to+rescan+rca+digital+converter+box PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4491433/normal_5fe6c8d896b38.pdfIn PDF document text
    • https://cdn.sqhk.co/wirowanorax/hbvPja2/89783552688.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447878/normal_603947cce58d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393644/normal_5ffe28daf292d.pdfIn PDF document text
    • http://pilinopumewaza.mywebcommunity.org/darth_plagueis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479235/normal_6049a4e35e8a6.pdfIn PDF document text
    • https://cdn.sqhk.co/dovinokobez/eijFiaR/fm_radio_tuner_pci_card.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/lunojol/lochinvar_armor_boiler_manual.pdfIn PDF document text
    • https://59548cc9-d6a6-4b2e-bd73-2bfb7290c7b5.filesusr.com/ugd/3fd21f_65e009bb50214efd8fad8c1a446a3c0f.pdf?index=trueIn PDF document text
    • http://minivenema.atwebpages.com/33704595393.pdfIn PDF document text
    • https://8ed6bd9f-de2b-4923-b7df-82f95eb18a03.filesusr.com/ugd/7fa32f_08060e78dd524a289bf355740c69a5a7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lixisariwulo/basic_english_usage_swan.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd073cb1-e085-4a37-9b71-f42361ad54d5/shampoo_solutions_for_oily_hair_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37349bf4-f19b-4038-896a-a938f0758f13/58978560875.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/53e3889e-2024-47cf-9b35-556f41e7f022/pikukiduwudotari.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bff4192c-91d8-43be-bb23-bac7e521aa85/how_to_start_python_machine_learning.pdfIn PDF document text
    • https://05e27880-d5e1-4d3d-8428-ba943e9300bc.filesusr.com/ugd/b56239_94a85d8002714dde8a9a37c696f54b8b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lonozote/bts_idol_song_mp4_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46246adb-4e83-446e-88e5-2bb2b6d4b144/5373128165.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_off0000dcb9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCB9 5428 bytes
SHA-256: 4854ca68c7605c538e7742fad1bacb4e2445359b3975aed2894d98becb9b4bb4
font_01_sfnt_off0000ef56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF56 10364 bytes
SHA-256: 9156676db1dc6fb5bd453ca353fcd23770454a18a3cf863e578b6025006a939e

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