Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d4809e61e5e3a21…

MALICIOUS

PDF

75.1 KB Created: 2021-03-18 00:14:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 5571594031090c00bb7331dc99396d30 SHA-1: a007ecc08fb7f18b62f7d08f6e40c317dd14b992 SHA-256: 6d4809e61e5e3a21b1ea47446c90399ac30012091f7b06717bc51a122ebbe624
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a phishing or redirection scheme. The presence of external URIs and link farm characteristics further supports this, indicating the document's primary purpose is to drive traffic to potentially 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://midufefew.ru/aws?utm_term=best+english+speaking+online+course+in+india PDF link annotation
    • http://datingdate.site/personal_loan_agreement_samplegabuz.pdfIn PDF document text
    • https://cdn.sqhk.co/nunepokuwe/AxwxheP/godolegemofomafo.pdfIn PDF document text
    • http://yyyyyyhhhhh.space/ge_cafe_gas_stove_3648mxk.pdfIn PDF document text
    • https://cdn.sqhk.co/togokitaz/gg1Xjh2/murder_be_the_king_mod_apk.pdfIn PDF document text
    • http://blancop.xyz/stephen_king_the_stand_cast_1994lhdjv.pdfIn PDF document text
    • https://cdn.sqhk.co/boxoveru/ejfiggd/game_powerboat_racing_3d_mod_apk.pdfIn PDF document text
    • http://tophomework.space/cursive_writing_practice_sheets_wordsupftt.pdfIn PDF document text
    • https://cdn.sqhk.co/lepemafe/hfRWhjY/tixix.pdfIn PDF document text
    • https://cdn.sqhk.co/pepupiribojo/zhiivjd/61885030794.pdfIn PDF document text
    • http://tipofeliluget.medianewsonline.com/all_saints_catholic_church_st_charles_mo.pdfIn PDF document text
    • https://cdn.sqhk.co/laruxibut/avijh36/sunglow_albino_corn_snake.pdfIn PDF document text
    • http://eduha.online/linea_del_tiempo_del_servicio_de_alimentos_y_bebidasjr7gu.pdfIn PDF document text
    • http://winoorama.site/40752067150eu3md.pdfIn PDF document text
    • http://kunujunekedi.mygamesonline.org/5643730660.pdfIn PDF document text
    • http://catsism.com/wuxugameromafamepeghxrrn.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rizoli/naxojazab.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/ardent_academy_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/billiards_games_free_mobile.pdfIn PDF document text
    • https://s3.amazonaws.com/regovadeje/27895843395.pdfIn PDF document text
    • https://s3.amazonaws.com/gawabog/bst_dongle_new_setup.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_off0000e7f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F4 5448 bytes
SHA-256: 377d399ebfba91e22930d5350ea4df143e47f389eeb53bc8a4902830eed6352b
font_01_sfnt_off0000fa73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA73 10756 bytes
SHA-256: 1fd7ab56231bbd7ccd79620d3bef3b6efb7dd1adaac9c39cabebb47e213e9d64

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