Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bbec30928829a60…

MALICIOUS

PDF

76.8 KB Created: 2021-05-12 21:41:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 93fc4eb624fffb9096f4fc85f2c2107b SHA-1: 2dde5e4dae3043013c008f0bff6d4e574eab1ab0 SHA-256: 1bbec30928829a6007361bb82df88e138995170b7dbc1a387f00a430aa58d3ad
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The presence of numerous embedded URLs, including those on disposable hosting and link farms, strongly suggests a phishing or malware distribution campaign. The document body, though heavily obfuscated, contains references to external URLs, reinforcing the attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/strik?utm_term=is+the+house+on+mango+street+a+novel PDF link annotation
    • http://scoretdho.best/xafezupitzj92n.pdfIn PDF document text
    • http://lotsmen.com/how_to_clean_the_inside_of_an_espresso_machinelybb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462993/normal_602da0c706816.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/eibU418/28987990739.pdfIn PDF document text
    • https://cdn.sqhk.co/tabewinudeka/drhdij5/jim_hopper_stranger_things_t_shirt.pdfIn PDF document text
    • http://academic-club.ru/reiki_symbols_tattoo_photoszq9gs.pdfIn PDF document text
    • https://cdn.sqhk.co/razilipot/fhj5gdG/76447108094.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476429/normal_5ff6ced170ea5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369653/normal_5ff1fc29b157e.pdfIn PDF document text
    • http://plafond.xyz/how_to_program_honeywell_outdoor_light_timerncuk5.pdfIn PDF document text
    • https://cdn.sqhk.co/xezufulozuwo/gjRgCLl/sazavonenunimugexojupi.pdfIn PDF document text
    • http://alkim.xyz/41964391185d6hsh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417656/normal_5fe66c42ef588.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/disadvantages_of_sexual_reproductiontwnm4.pdfIn PDF document text
    • https://cdn.sqhk.co/lenawemijixe/fhdjdgd/nefuroxixidemoluwapom.pdfIn PDF document text
    • http://woodlesenka.ru/96953165800eso7b.pdfIn PDF document text
    • http://wusejopajaxus.22web.org/58929537311.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://baguzakanaso.epizy.com/just_dance_2020_pour_console_wii.pdfIn PDF document text
    • https://s3.amazonaws.com/takebemanijewok/addition_worksheets_grade_1_printable.pdfIn PDF document text
    • https://s3.amazonaws.com/kofabube/13035409224.pdfIn PDF document text
    • https://s3.amazonaws.com/gewuwasi/sociopath_next_door.pdfIn PDF document text
    • https://s3.amazonaws.com/dazovosugev/create_a_weekly_calendar_template.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_off0000eeb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEB1 5096 bytes
SHA-256: b5b665343f857951d90e140c643c1f4efdfd1f714f383bbbbd16d443fe37efcd
font_01_sfnt_off0000ffdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFDF 11056 bytes
SHA-256: 9387022e4130f2d27fb009d0363121d14903b05fe5634d56be7ab49d18c3ec61

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