Malicious PDF — malware analysis report

Static analysis result for SHA-256 4c3426ec7aad9e5f…

MALICIOUS

PDF

73.3 KB Created: 2021-03-07 05:03:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: b400ef9950b223ff7a0e2e0288682dba SHA-1: 64c27e375651a19f5f7477d59cb60177ed920621 SHA-256: 4c3426ec7aad9e5fed0060207eccb509ed2bc9260e7ff799d05325870953cfa3
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file contains multiple heuristics indicating malicious intent, including a critical finding for a link to known malicious redirector infrastructure. The presence of a visual download button further supports a phishing or malware delivery lure. Although no scripts were extracted, the ML classifier and ClamAV detection strongly suggest this PDF is malicious and likely attempts to exploit vulnerabilities or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/wix?keyword=apk+bbm+2019 In PDF document text
    • https://xoselupovogim.weebly.com/uploads/1/3/4/6/134610719/fonozas.pdfIn PDF document text
    • https://lefiletigej.weebly.com/uploads/1/3/4/5/134597596/suvilifuvifuka.pdfIn PDF document text
    • http://ruzoboxilotazex.22web.org/33291677259.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/607ca.pdfIn PDF document text
    • http://namekegosanobus.22web.org/shola_aur_shabnam_movie_hd.pdfIn PDF document text
    • http://xexogafuko.22web.org/vugimupen.pdfIn PDF document text
    • https://datotizit.weebly.com/uploads/1/3/4/6/134696706/nesonotuzemefi.pdfIn PDF document text
    • https://ropedali.weebly.com/uploads/1/3/0/9/130969406/656913.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rinafuladimuk.epizy.com/54495698387.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57a7e353-ebee-406c-a4de-1f2564d21215/18119521398.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5dbda06-ac3e-4560-b4e3-27d6dd88b209/how_many_words_is_harry_potter_6.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67db2c2d-9816-454f-8484-d8267701691c/how_much_does_it_cost_to_learn_mandarin.pdfIn PDF document text
    • http://lulovijolezon.epizy.com/degeminixebaf.pdfIn PDF document text
    • http://vezolojinugavet.epizy.com/sound_blaster_audigy_2_zs_sb0350.pdfIn PDF document text
    • http://lojosikol.epizy.com/51832970022.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dc15532a-28ab-4508-b9bb-5ac6d888531b/jofigiv.pdfIn PDF document text
    • http://lenomona.rf.gd/zitanozomumepozuwevora.pdfIn PDF document text
    • http://pumojifazugeme.rf.gd/nissan_xterra_service_engine_soon_reset.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7b084ec-efdb-42bd-956e-fdbd257114fd/walitem.pdfIn PDF document text
    • http://fidusolufunenu.rf.gd/imdb_top_movies_2019_bollywood.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_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 5124 bytes
SHA-256: 4b64e7aad546115e7a2b61bc5189095b913f7aca1dbc0c21c0956841910caa88
font_01_sfnt_off0000f3f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F0 10852 bytes
SHA-256: a9205a2d71d5e9821bbd10a7ae0071b1a892cca60051ef5dbe06a22beeecad79

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