Malicious PDF — malware analysis report

Static analysis result for SHA-256 99573b3042406c53…

MALICIOUS

PDF

88.5 KB Created: 2021-04-06 11:21:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 4ed29d3abb4787ffac2520a9fddde304 SHA-1: 79a69461a9d42f2d3a60310cc0dc6df1e7e25af7 SHA-256: 99573b3042406c531db59dd421665d160228ba7821d06c8228f7067b7957b182
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are characteristic of phishing lures designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://druttle.ru/strik?utm_term=1200+calorie+diet+plan+to+lose+weight+fast PDF link annotation
    • http://kazaxukiga.getenjoyment.net/agenda_21_global_resumo.pdfIn PDF document text
    • http://duwinijuj.mypressonline.com/calculus_3_exam.pdfIn PDF document text
    • http://ruwazumusef.scienceontheweb.net/does_dunkin_have_vanilla_iced_coffee.pdfIn PDF document text
    • http://hookup757.fun/zefutisiyfmsd.pdfIn PDF document text
    • http://axecheat8.xyz/how_to_make_a_budget_on_quickenj3p71.pdfIn PDF document text
    • http://busapibasin.mypressonline.com/mugisetitisigowu.pdfIn PDF document text
    • http://jiwimejikigigu.mywebcommunity.org/80397153625.pdfIn PDF document text
    • http://kukushpa.fun/77394166264guhfw.pdfIn PDF document text
    • http://raisinshub.club/zazuwopibipetavefaxizati3slfm.pdfIn PDF document text
    • http://somukegizos.66ghz.com/2520457951.pdfIn PDF document text
    • http://fashion-deals.xyz/pancharatna_kritis_lyrics_with_swaras_in_kannadaud5oz.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://padijajuvon.rf.gd/pcr_full_form_related_to_police.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6aeaecd7-ee2c-4295-8b31-3ee37ab01781/rebecca_daphne_du_maurier_new_film.pdfIn PDF document text
    • http://pijularof.epizy.com/glossary_of_computer_science_terms.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0baa653-f701-4bb5-8f26-194b5324f9de/vivexepipujog.pdfIn PDF document text
    • http://jerananixakuzeb.epizy.com/87691038147.pdfIn PDF document text
    • http://vomifavub.epizy.com/sex_and_the_city_cast_2020.pdfIn PDF document text
    • http://pekopun.epizy.com/cumulative_flow_diagram_safe_information.pdfIn PDF document text
    • http://komoxam.rf.gd/83057186276.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5195e2ab-0d99-45cf-b011-b0b99368eb02/heat_n_glo_repair_near_me.pdfIn PDF document text
    • http://pifazudiso.rf.gd/demeturofojapowupar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dadf25eb-4cd4-4e73-a736-c6c446b9cb3d/95650236096.pdfIn PDF document text
    • http://tizivedimusos.epizy.com/biblia_de_estudio_john_macarthur.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d83d8ce7-12d9-43de-b661-ac37b2985a10/69513944094.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_off00011990.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11990 5740 bytes
SHA-256: b445e5a9dbb2611f326ade019015f0173e0d2b125a35560275f3655cbf480c10
font_01_sfnt_off00012d2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D2D 11612 bytes
SHA-256: 73c75ba4e0584528b9651197369fc4a281ee5def661382a9d6bf0321a9d07465

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