Malicious PDF — malware analysis report

Static analysis result for SHA-256 8caeaff1bbf23c77…

MALICIOUS

PDF

108.8 KB Created: 2021-03-24 18:53:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: bd4a0b54d9a2a16507e67a069cad0988 SHA-1: e922413872a29c8e6cf9624294b54e289444a671 SHA-256: 8caeaff1bbf23c77084b80bbdf2e93a8d205a0755272f06ef98698ccd664173d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Numerous embedded URLs were found, many pointing to disposable hosting and acting as a link farm, indicating a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to historical French society, likely a lure to disguise the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://dafemum.ru/strik?utm_term=describe+the+three+estates+of+french+society+and+explain+why+this+system+angered+the+third+estate
    • https://cdn.sqhk.co/lilaxikixo/aijlQgi/weathertech_canada_cyber_monday.pdf
    • https://cdn.sqhk.co/ruxuzobisu/fhighla/24652782289.pdf
    • http://rifijetuvijilam.medianewsonline.com/problemas_movimiento_rectilineo_uniforme.pdf
    • http://beautysale.site/stranger_things_season_3_soundtrackkf747.pdf
    • http://habercigo.com/debupexojelabiluzehh8np.pdf
    • http://gamedv.design/what_are_the_advanced_excel_formulasf2t4o.pdf
    • http://varistop.site/how_to_install_linksys_ac1200_wifi_range_extendery1uj9.pdf
    • https://cdn.sqhk.co/kakapoxavu/iaClBic/master_car_climb_racing_3d_apk.pdf
    • http://topuniversityru.fun/bajrang_dal_logo_hd_wallpaperjr4dt.pdf
    • https://nuvisinuxaxo.weebly.com/uploads/1/3/1/3/131383681/wibogovinuxev.pdf
    • https://mufamemibota.weebly.com/uploads/1/3/1/8/131856380/tetawejiverixakexil.pdf
    • http://vuwefedope.sportsontheweb.net/what_are_the_components_of_a_good_news_story.pdf
    • https://cdn.sqhk.co/satofurijob/gdjj9hi/movistar_plus_lite_acceso.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/be6bf300-df64-4249-a739-1139a1058db6/9845735973.pdf
    • https://uploads.strikinglycdn.com/files/e8fd76db-a42d-4e23-9120-1b9a8969b743/porugovotam.pdf
    • https://s3.amazonaws.com/bibejovixapis/cccam_panel_free.pdf
    • http://dezobod.onlinewebshop.net/ruworejifalobaw.pdf
    • https://s3.amazonaws.com/luramamelolem/fifty_shades_freed_hindi_dubbed_movie_download_300mb.pdf
    • http://murapimopavopa.myartsonline.com/fozibepofopuf.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000166a9.bin
2b76bdab29336ac95f0ecd8db260d0a14e4744dd693e40858ba0d6ea738d5393		 pdf-font-stream PDF embedded font (sfnt) at offset 0x166A9 5968 bytes
font_01_sfnt_off00017af5.bin
8f0bcc12b97e80654e0245ad40d474e5793b9204d5b6cb674d3d0e09f2530e8c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17AF5 13168 bytes

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