Malicious PDF — malware analysis report

Static analysis result for SHA-256 b23e55be7f732092…

MALICIOUS

PDF

90.5 KB Created: 2021-03-25 10:43:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ef9ba5278be5e717e3a611fc52374ea5 SHA-1: 39d8c24bedc345d8334aeda684e4119021f5dcca SHA-256: b23e55be7f73209234134add6e666e688ffa2509150dafeda6466b55a085526d
186 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links to external websites, many of which are hosted on disposable domains, indicating a link farm or phishing attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://resalured.ru/strik?utm_term=how+is+carlo+killed+in+the+godfather PDF link annotation
    • http://katerevemoposab.iblogger.org/felosopizop.pdfIn PDF document text
    • https://wufujaxuwagax.weebly.com/uploads/1/3/4/4/134400484/kamuxifulepiv_vusijoxew_xibinatutesapik.pdfIn PDF document text
    • http://zotokes.iblogger.org/kulog.pdfIn PDF document text
    • http://wubujogulekaf.iblogger.org/create_and_download_file_in_php.pdfIn PDF document text
    • https://tabogivazosepa.weebly.com/uploads/1/3/1/8/131871767/7390570.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425492/normal_600088f023560.pdfIn PDF document text
    • http://lofuzuwe.22web.org/boy_scout_merit_badge_pamphlets_download.pdfIn PDF document text
    • http://bowifazalek.iblogger.org/algebra_1_linear_equations_test.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478125/normal_5fea15b9d3144.pdfIn PDF document text
    • http://fivibimotuwar.22web.org/noritz_tankless_water_heater_flushing_instructions.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5dc41c26-3296-4334-9308-328b393b6367/dofisamarosubuvurojad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fecf9ec0-ce58-4478-8877-07cd75eeadb6/10000_reasons_lyrics.pdfIn PDF document text
    • https://s3.amazonaws.com/lakadutof/hello_movie_anaganaga_song_ringtone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ef3f9f75-59a5-4e79-b6c6-337eb0e26595/what_does_ellipsis_mean_in_english.pdfIn PDF document text
    • https://s3.amazonaws.com/tizowodifi/carcereiros_1_temporada.pdfIn PDF document text
    • https://s3.amazonaws.com/wazorixekunafob/90264053313.pdfIn PDF document text
    • https://s3.amazonaws.com/xelimewat/dodge_ram_workshop_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59bfbd5e-3ab6-48e1-a669-73a6d31cda80/math_workbook_grade_1_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7320f403-e99b-4c26-a748-6a4395253b7c/girlboss_espaol.pdfIn PDF document text
    • http://vogojitipam.epizy.com/vusogeneriboginokerokixa.pdfIn PDF document text
    • https://s3.amazonaws.com/zolerazowubow/small_sheets_of_plexiglass.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011612.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11612 5188 bytes
SHA-256: 11f3992801c9356fa385a0b319d0554e4f78f314ddc1060a58ff16bde7b17df0
font_01_sfnt_off000127b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127B6 11480 bytes
SHA-256: 08edfeb5010d8ad23e4d6ccbed3bdb21db5402123b8fd494822a1cb82618d7d9
font_02_sfnt_off00014ea4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14EA4 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3