Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3a679539a24536…

MALICIOUS

PDF

82.2 KB Created: 2021-03-20 16:07:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 853d7f9ca7d7ddebe9a11f9eb877bca2 SHA-1: 1e02031247896d2b604abc5a4acc538e0b91bdd9 SHA-256: 4b3a679539a245368714424d1a3ec9ec55723dcf6700b00b95d952fad70b4a68
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links pointing to disposable domains, identified as a link farm and a redirector to malicious infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/wix?keyword=science+bowl+physics+study+guide In PDF document text
    • http://fezatubiwe.getenjoyment.net/apologia_de_socrates_editorial_gredos.pdfIn PDF document text
    • http://xenakasewexibal.sportsontheweb.net/anglo_saxon_literature_characteristics.pdfIn PDF document text
    • http://bopugafuwu.scienceontheweb.net/sojuxetorotekijarox.pdfIn PDF document text
    • http://wivaserana.mywebcommunity.org/brain_on_fire_memoir.pdfIn PDF document text
    • https://funujitumim.weebly.com/uploads/1/3/5/3/135347265/72685037.pdfIn PDF document text
    • http://whalesqpa.fun/baby_jogger_city_mini_gt_double_britax_car_seat_adapterpdi29.pdfIn PDF document text
    • http://nejevefivi.mypressonline.com/sightseeing_london_map.pdfIn PDF document text
    • https://goguribepolim.weebly.com/uploads/1/3/0/7/130739596/dagujig.pdfIn PDF document text
    • http://smilex.club/42920390562k18o2.pdfIn PDF document text
    • http://presentinsta.site/nipuxa72xzy.pdfIn PDF document text
    • http://wordsideget.top/star_trek_discovery_cast_salaries8uxgt.pdfIn PDF document text
    • http://texoraw.sportsontheweb.net/buell_xb12r_service_manual.pdfIn PDF document text
    • https://wegakerovosa.weebly.com/uploads/1/3/0/8/130873826/3461687.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/pengobatan_pneumonia_pada_balita.pdfIn PDF document text
    • https://kixasakuzejud.weebly.com/uploads/1/3/5/3/135347884/49b3bab788d8b46.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/missile_equations_of_motion.pdfIn PDF document text
    • http://sodahub.pro/jotirojuliwuwed5spci.pdfIn PDF document text
    • http://xelowonol.scienceontheweb.net/damodaran_on_valuation_free_download.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3301231-5297-4633-abde-0547eb3cb250/2007_jeep_grand_cherokee_for_sale_craigslist.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/717ae32e-57cd-4aa8-bc9f-cadc4b367d65/shapes_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/40fe6f94-1298-4928-bb6a-fb51ec40d4a0/exploring_chemical_analysis_3rd_edition.pdfIn PDF document text
    • http://gosaduzunake.myartsonline.com/39022049366.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f6ee62d6-1ba1-4f02-866f-db012d840911/rolufan.pdfIn PDF document text
    • http://jugomirusulove.atwebpages.com/piping_interview_questions_and_answers_free_download.pdfIn PDF document text
    • http://kemesuxaw.myartsonline.com/why_is_my_camera_upside_down_iphone_xr.pdfIn PDF document text
    • http://nakarajibap.myartsonline.com/how_to_return_cutco.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_off00010345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10345 5468 bytes
SHA-256: 2b441f2119e04519cd39ed55580201383f652d7a00228bbbea0fd346d368b8ff
font_01_sfnt_off000115ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115EE 10788 bytes
SHA-256: 36b08117e6880fab237c91231fa1a5938eedbcd8813553172d191360fd9af8c0