Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7e90ffcb1b19500…

MALICIOUS

PDF

71.7 KB Created: 2021-03-28 18:14:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 909706feed441e04982b633f0e7fc961 SHA-1: 8f28dcf7bb3cbb940b4825168acd3099ec18f32d SHA-256: a7e90ffcb1b1950017c32fa757ed220c64744fb5c4c49e8d0ecf4377d727fb65
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are associated with link farm heuristics, suggesting a phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and URL patterns are consistent with malicious documents designed to redirect users to malicious sites.

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://soxebez.ru/123?utm_term=dmv+permit+test+answers+nc PDF link annotation
    • http://centerverifybadge.com/nosanifusijotamirf9r5q.pdfIn PDF document text
    • http://sparzha.club/meraxigezujisozefof3yiz3.pdfIn PDF document text
    • https://posolefuriw.weebly.com/uploads/1/3/4/3/134374222/653cc8368b1e.pdfIn PDF document text
    • http://wiinorama.space/what_god_wants_for_christmas_family_lifeh47ti.pdfIn PDF document text
    • http://rivilidopu.medianewsonline.com/kodak_printer_esp_3250_instruction_manual.pdfIn PDF document text
    • http://raxejudesezix.scienceontheweb.net/56676774418.pdfIn PDF document text
    • https://wupixizot.weebly.com/uploads/1/3/5/3/135398135/wujopoma.pdfIn PDF document text
    • https://kafaziwe.weebly.com/uploads/1/3/1/0/131070109/9a5e7433c1e.pdfIn PDF document text
    • http://kubuvifabitowib.iblogger.org/how_to_connect_fujitsu_scansnap_ix500_to_computer.pdfIn PDF document text
    • https://suxekupawuva.weebly.com/uploads/1/3/2/7/132710704/f14803e.pdfIn PDF document text
    • http://lunagogafoxoj.sportsontheweb.net/17971842214.pdfIn PDF document text
    • http://lirifajo.sportsontheweb.net/miami_hurricanes_football_schedule_2020.pdfIn PDF document text
    • https://vulelarebu.weebly.com/uploads/1/3/4/9/134900748/jesarivodutu-letuge.pdfIn PDF document text
    • https://xovonugobo.weebly.com/uploads/1/3/4/6/134688771/2197710.pdfIn PDF document text
    • https://togelugifipa.weebly.com/uploads/1/3/4/6/134648123/fojiwukajutako-janewak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakelasu.rf.gd/51441603495.pdfIn PDF document text
    • http://defakulid.atwebpages.com/chemistry_12_formula_sheet.pdfIn PDF document text
    • http://pakewerulawe.rf.gd/xekowobujimer.pdfIn PDF document text
    • http://xuvuzonixo.onlinewebshop.net/myron_mixon_brine_recipe.pdfIn PDF document text
    • http://ketabigumowun.atwebpages.com/53859803613.pdfIn PDF document text
    • http://jirabasojexosud.atwebpages.com/subwoofer_amplifier_circuit_diagram_download.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_off0000de1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE1A 5200 bytes
SHA-256: b9e883896ff9cb2ec98c009966d9ae84b626bf48d3a3f2157e1a5dfccc9a88c8
font_01_sfnt_off0000efcc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFCC 9956 bytes
SHA-256: 00c6f14e851cbf1cd6837ae9437f0d78fe32eb82c114490350b2cea715573438

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