Malicious PDF — malware analysis report

Static analysis result for SHA-256 52e787d4234b4790…

MALICIOUS

PDF

81.2 KB Created: 2021-03-16 22:32:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 7c1d6b98136fd0c0ef956dcce1ecc49a SHA-1: db8620a50ffdd0894255a1b7251aabcfdc9d3917 SHA-256: 52e787d4234b47905768daf7f562468dfec83785e13c395fe747b183347d9609
184 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with several pointing to known malicious redirectors and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to lure users to malicious sites, aligning with T1566.001 (Spearphishing Attachment).

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
  • 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://crophysi.ru/wix?keyword=the+three+b%2527s In PDF document text
    • http://wosozage.mypressonline.com/cadena_de_suministro_unam.pdfIn PDF document text
    • http://lubevos.scienceontheweb.net/61286643413.pdfIn PDF document text
    • http://pivolirarorip.mypressonline.com/maze_runner_series_kill_order_movie.pdfIn PDF document text
    • http://xuritepizib.mygamesonline.org/solidworks_manual_download_free.pdfIn PDF document text
    • https://cdn.sqhk.co/wegodimumod/f8Bgigu/xulipizogofevinini.pdfIn PDF document text
    • http://sepozimog.scienceontheweb.net/66537954888.pdfIn PDF document text
    • http://betizekaxu.getenjoyment.net/cryopreservation_methods.pdfIn PDF document text
    • http://jarisudowapebi.sportsontheweb.net/kindergarten_math_worksheets_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/fonizijodi/iaPx3hb/schengen_visa_application_form_word_format.pdfIn PDF document text
    • https://cdn.sqhk.co/jinubodilev/jjbgdia/rutefewugesef.pdfIn PDF document text
    • https://cdn.sqhk.co/jarogofef/gfSgha0/flight_7500_movie_free.pdfIn PDF document text
    • http://jedusajinud.mygamesonline.org/vuxepimokusulibu.pdfIn PDF document text
    • http://bizowokare.getenjoyment.net/wekiw.pdfIn PDF document text
    • https://cdn.sqhk.co/guvelebul/ieBLjcO/suvoxuxulodagurikawomomi.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/a815c344-2fbb-4159-906b-1dbb47c81e5b/evenflo_exersaucer_triple_fun_entertainer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2241394-fa99-4067-93d3-fdb36d9f419c/66332129823.pdfIn PDF document text
    • http://tevefetilojas.atwebpages.com/81942531192.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fb227ee-492d-447a-8e4b-f777bf4be1a6/89855079639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5d8eaa2a-6dbf-4793-ba9f-689404695b3f/2008_ford_escape_transmission_fluid_fill.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e29a9cf0-6636-48f7-9175-30a4d8a582c4/70119361441.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED5B 4652 bytes
SHA-256: 541b22b1a5bb60eaa87f9d08135c37c8bb4b0b9cdeb347b001f3d2689e638d30
font_01_sfnt_off0000fd2a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD2A 10964 bytes
SHA-256: 0ccd4202a5d94186b1be7223c52c7bd72abbfa3fecaa8b309410943cb9a37b96
font_02_sfnt_off000122d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122D8 16136 bytes
SHA-256: e1d2be6f2f093e4abfe2695cf717dcbf73111d49d4ea3cffe9d2ebada4e87b8a