Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4d2cf0af71f9bcf…

MALICIOUS

PDF

89.6 KB Created: 2021-06-07 08:31:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: f35853e8a304d3d16cbd8a32e6af0b39 SHA-1: f23c474ee91a2c88c778addb003833565f5289eb SHA-256: b4d2cf0af71f9bcf8baf3858599d50f35ea2fb731f8a70b630c77fe0e0fc15fa
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to disposable hosting and link farms, indicating a phishing or malicious redirection attempt. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM and ML_NYX_PDF_MALICIOUS firings strongly suggest malicious intent. The primary URL identified, https://synerhu.ru/pbw, is likely part of a campaign to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://synerhu.ru/pbw?utm_term=zombocalypse+2+unblocked+76 PDF link annotation
    • https://zomimodobi.weebly.com/uploads/1/3/0/7/130739583/d94b1e913735ac5.pdfIn PDF document text
    • https://tabikajodunel.weebly.com/uploads/1/3/0/7/130739544/6184329.pdfIn PDF document text
    • https://zobanegasub.weebly.com/uploads/1/3/1/1/131164549/22245e9331f74.pdfIn PDF document text
    • https://jojimixumomural.weebly.com/uploads/1/3/4/4/134438106/9049873.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jebusolole.pbworks.com/f/1000336881.pdfIn PDF document text
    • http://nowefuro.pbworks.com/w/file/fetch/144597147/gaggia_brera_cleaning_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd9c4c5c-78f7-4ce5-96cf-d2c3ed4b1d3f/how_to_get_extra_money_to_pay_off_debt.pdfIn PDF document text
    • http://zuwofig.pbworks.com/w/file/fetch/144646725/glory_betting_tips_vip_free_download.pdfIn PDF document text
    • http://faxamom.pbworks.com/f/what_is_static_determinacy.pdfIn PDF document text
    • http://wuxikadafi.pbworks.com/f/pekarogam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/14839c57-bad6-4c34-bed3-3af13449b85e/44058871089.pdfIn PDF document text
    • http://supatibu.pbworks.com/f/nadebuzuletiloweroreno.pdfIn PDF document text
    • http://kivotin.pbworks.com/f/10984155686.pdfIn PDF document text
    • http://tagutijak.pbworks.com/w/file/fetch/144677256/project_human_resource_management_pmbok_ppt.pdfIn PDF document text
    • http://sajateves.pbworks.com/f/metro_map_washington_dc.pdfIn PDF document text
    • http://vefubop.pbworks.com/f/92928625980.pdfIn PDF document text
    • http://niwomif.pbworks.com/w/file/fetch/144564189/wuketimuvovedefujudow.pdfIn PDF document text
    • http://bupataved.pbworks.com/w/file/fetch/144420834/writing_algebraic_expressions_from_word_problems_worksheets_6th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f65953fb-b2ab-4f86-a69e-97e21a495e78/kiwob.pdfIn PDF document text
    • http://fixulirulafa.pbworks.com/w/file/fetch/144656070/51776541207.pdfIn PDF document text
    • http://kigiputilik.pbworks.com/f/47662769101.pdfIn PDF document text
    • http://nomebazeregi.pbworks.com/w/file/fetch/144766116/device_unlock_t_mobile_apk_descargar.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_off00011fc8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FC8 5752 bytes
SHA-256: 9bc5ee8d3c30011cffbc09960056358e4075ee5b3a595ea8f457cedb7bd4842b
font_01_sfnt_off0001335e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1335E 11176 bytes
SHA-256: 6862facaa9f1957fb8384e2c93ff286be226e2fbf922e22a4406a43bf4bc3ea9

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