Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc4873bd6a4deae0…

MALICIOUS

PDF

82.9 KB Created: 2021-05-13 02:42:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4656fbb7ca1d1f984539804bdc9708d4 SHA-1: 28ee8533297ba94e70af8a4232ae7e0c25ac3669 SHA-256: cc4873bd6a4deae04575f2f3237c973c0089ca360fb62dfb3a618f3ff69b2bd8
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many pointing to domains with unknown reputations, suggesting a phishing or credential harvesting attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a deliberate attempt to create a link farm on disposable hosting, further supporting a malicious intent.

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://leonvi.ru/strik?utm_term=the+story+of+arthur+truluv+by+elizabeth+berg PDF link annotation
    • http://delayikapy.xyz/addition_to_20_worksheets_year_15cvpi.pdfIn PDF document text
    • http://yoga-fitness.space/how_to_install_a_wireless-n_wifi_repeater24260.pdfIn PDF document text
    • http://ita-fitness.fun/jozagedye8me.pdfIn PDF document text
    • http://datingsexchat.site/goodbye_lullaby_avril_lavigne_album_free2envt.pdfIn PDF document text
    • http://how2clever.com/2005_honda_pilot_transmission_cooler_problemsref0j.pdfIn PDF document text
    • http://umkatrade.ru/pusafunoz2oaf7.pdfIn PDF document text
    • http://bonifacy.site/what_is_multilevel_inheritance_explain_with_examplebjlu2.pdfIn PDF document text
    • http://vostokzapad.su/14244444110u3i65.pdfIn PDF document text
    • http://sabazat.22web.org/what_is_the_best_temperature_for_a_whirlpool_refrigerator.pdfIn PDF document text
    • http://reactivaperu-viabcpi.com/dozopop51sqw.pdfIn PDF document text
    • http://idem-peshkom.ru/67749649593tjm4h.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ae8c1479-5121-4009-b0ed-8259dbb1205b.filesusr.com/ugd/0aff45_14f4b59be7f241249ae462c2b9c25b62.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c873e576-9be1-455d-b03e-5fbada7b8bf2/44526455030.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/987a4845-d3db-4eb3-bca4-f69e28bcbfab/kosenerovexim.pdfIn PDF document text
    • http://xibunagevidaze.rf.gd/tosuduxakupexivumi.pdfIn PDF document text
    • https://ff8eac81-0dee-4da4-b7c1-1dee070544a7.filesusr.com/ugd/2637cf_78c8cf8cdd6a40b1a6e1dc0f73d4844b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/45b2a5c0-3c1d-460b-864e-7ab8b43ebc3d/19089291350.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7040ffb-60d6-42b7-a521-2f34291df6bd/aircraft_cabin_technician_jobs_in_uae.pdfIn PDF document text
    • https://78ff948a-0765-49f5-a22c-0fbe0eba7848.filesusr.com/ugd/888d0b_df854eab75004d7c819bde12f82150ba.pdf?index=trueIn 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_off00010566.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10566 5328 bytes
SHA-256: 42b224b92008bc55ec2a27e6490d40037afb27deece700e97c32846caae208ac
font_01_sfnt_off0001179d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1179D 10776 bytes
SHA-256: c3a306383f2045ca99f275c6dc0e8f42e4399e5ef853208e4b659ca3ceef45e1

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