Malicious PDF — malware analysis report

Static analysis result for SHA-256 592ae648cb486d2e…

MALICIOUS

PDF

90.5 KB Created: 2021-02-28 17:36:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 9705b09fb08faa23a12fcd869fc97fa7 SHA-1: 24641bc4101e19b905d13f76a3ec4b4b6166506e SHA-256: 592ae648cb486d2e600fe0e499df825be21d9ea706dd0140cab006a14f7ce620
156 Risk Score

Malware Insights

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

The sample is a PDF document that contains a large number of external links, indicative of a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The embedded URLs point to various domains, some of which are associated with SEO-optimized PDF content, further supporting the link farm attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://jacksth.ru/123?utm_term=best+invisible+selfie+stick+for+gopro+max PDF link annotation
    • http://rajukilodagoje.mygamesonline.org/how_to_draw_a_person_for_beginners_manga.pdfIn PDF document text
    • http://bamefidev.mygamesonline.org/similarities_and_differences_of_apple_and_orange.pdfIn PDF document text
    • http://mujabelor.mywebcommunity.org/39854009528.pdfIn PDF document text
    • https://sukaxivex.weebly.com/uploads/1/3/4/8/134895869/a0d89315.pdfIn PDF document text
    • https://totidulabi.weebly.com/uploads/1/3/1/6/131606487/rugokixoxamajug.pdfIn PDF document text
    • http://leftoutclub.com/how_to_find_the_mean_median_and_mode_in_a_frequency_distribution_tablenkeyh.pdfIn PDF document text
    • https://bopamoverera.weebly.com/uploads/1/3/1/4/131408256/8101429.pdfIn PDF document text
    • http://vuvulusigi.scienceontheweb.net/does_1_rep_max_build_muscle.pdfIn PDF document text
    • http://pupezawat.scienceontheweb.net/viratikurupomipawelazodum.pdfIn PDF document text
    • https://volinamonapefez.weebly.com/uploads/1/3/4/4/134494747/kazexusom.pdfIn PDF document text
    • https://lipuxavevafip.weebly.com/uploads/1/3/1/3/131398459/a378933d1.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/toniseligiwuzux/bulem.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/bivabirujoxaxegi.pdfIn PDF document text
    • https://s3.amazonaws.com/lolaritemukole/fluoroscopic_guided_nerve_block.pdfIn PDF document text
    • https://s3.amazonaws.com/nevovumowa/descargar_certificado_de_secundaria_cdmx.pdfIn PDF document text
    • https://s3.amazonaws.com/vipinib/10318022802.pdfIn PDF document text
    • https://s3.amazonaws.com/paropabaru/toyota_avensis_2002_service_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxexi/nifedipine_available_dosage_forms.pdfIn PDF document text
    • https://s3.amazonaws.com/jinabisura/52210824071.pdfIn PDF document text
    • http://vejegaba.atwebpages.com/why_did_the_spanish_establish_missions_in_texas.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/are_mercedes_expensive_to_repair.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_off0001244e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1244E 5716 bytes
SHA-256: 5369c1986572bbc879b2a7e2e4199d5c4acfd2f0ca07cd6ee066c672b3a4fdf2
font_01_sfnt_off000137c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x137C1 10624 bytes
SHA-256: a783abdae9262d64e65218b1fd12b999d615ebedd65d7475a107560b0ad971d7

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