Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c8d57510e12a7f7…

MALICIOUS

PDF

74.4 KB Created: 2021-03-15 00:34:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 11198a04c2af77008b3ae2c824b333a2 SHA-1: d0b31c05f34d588de9aa465c33c1818e1c018ac6 SHA-256: 9c8d57510e12a7f7d44140d8583ee323ea41ca91d31a3dd2a5ccdda01fe670c2
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, exhibiting characteristics of a phishing or trojan delivery mechanism. It contains numerous embedded URLs, with one prominent URL leading to a domain associated with disposable hosting and potentially malicious content. The document body, though heavily obfuscated, appears to be a lure related to a book summary, likely intended to trick users into clicking malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=house+on+mango+street+summary+shmoop
    • http://xolidila.iblogger.org/14478072454.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://rowesupigoz.epizy.com/excel_sheet_example_xls.pdf
    • http://fuxazulofonu.epizy.com/tecnicas_de_recoleccion_de_datos_en_una_investigacion_cientifica.pdf
    • http://godotarubaxo.rf.gd/5168124100.pdf
    • https://s3.amazonaws.com/dukexajuj/pulmonary_av_malformation_icd_10.pdf
    • https://uploads.strikinglycdn.com/files/02e4c458-0597-4bd1-8176-6fc942aa34ea/93765834565.pdf
    • http://sosasofojatage.epizy.com/best_navigation_apps_for_android_auto.pdf
    • http://butopam.rf.gd/20016716883.pdf
    • https://s3.amazonaws.com/gewuwasi/64847975733.pdf
    • http://topotiras.rf.gd/how_to_arrange_descending_order_in_word.pdf
    • https://uploads.strikinglycdn.com/files/41ea94d7-7d31-40f6-9cda-de65eb7a1037/jaxupu.pdf
    • http://gamugeko.rf.gd/m-audio_oxygen_25_manual.pdf
    • http://vofopinalog.epizy.com/gototiraduwo.pdf
    • https://uploads.strikinglycdn.com/files/538877ed-ddd3-429a-bd4b-4c24276dc801/how_to_write_titles_in_ap_style.pdf
    • https://uploads.strikinglycdn.com/files/fedd59eb-5ce8-48d2-a190-3155d1ddc8b4/greystoke_the_legend_of_tarzan_lord_of_the_apes_full_movie_free.pdf
    • http://jebetumupogo.rf.gd/how_to_fix_a_squeaking_samsung_dryer.pdf
    • http://xosumuzav.epizy.com/yakushima_hiking_guide.pdf
    • https://s3.amazonaws.com/wisuw/windows_10_version_1903_slow.pdf
    • https://uploads.strikinglycdn.com/files/1d5d3981-b4b1-43a8-aee3-5bfbaa3f3cb8/legowu.pdf
    • http://tikisomoxo.epizy.com/rewegedonirinil.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_off0000e6fa.bin
384fd2ef1aabe09208e5726c3724f0cb1c117563979a4bf4ba5ba945a62cda9e		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 5264 bytes
font_01_sfnt_off0000f8ba.bin
fe1f2486ddc98be0220e56cf06e809621b0c5a5f84daa34fc653dc0df25fdeb6		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8BA 10496 bytes

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