Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61ce9b0ffe56bd1…

MALICIOUS

PDF

68.6 KB Created: 2021-01-18 07:51:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 45c50a77c4071903ddc2f4b4d9e18ce3 SHA-1: e9ae22714c708d3044b00fc96a2381528be2f2b5 SHA-256: d61ce9b0ffe56bd16d5f9847239e71b8aa12a9fed15d8a04d6a6b9535ad9e102
214 Risk Score

Malware Insights

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

The PDF contains multiple embedded links, with one identified as a malicious redirector. The ML classifier and ClamAV also flagged this file as malicious. The presence of numerous external links suggests an attempt to direct users to potentially harmful content or phishing sites, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://traffmen.ru/123?utm_term=minecraft+plains+seed+pe In PDF document text
    • https://jepuderakemuso.weebly.com/uploads/1/3/4/6/134666912/1883101.pdfIn PDF document text
    • https://site-1228032.mozfiles.com/files/1228032/reneluridi.pdfIn PDF document text
    • https://site-1176876.mozfiles.com/files/1176876/ubuntu_19__04_virtualbox_image.pdfIn PDF document text
    • https://fanofowos.weebly.com/uploads/1/3/4/5/134576313/rifofisonexunol-jozuv-zijebevowajovi.pdfIn PDF document text
    • https://site-1171643.mozfiles.com/files/1171643/missing_children_in_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/kifavubivelo/bjfoJP8/enviar_sms_gratis_a_cuba_sin_registro.pdfIn PDF document text
    • https://xukaxibuban.weebly.com/uploads/1/3/4/7/134701669/1fec77e30.pdfIn PDF document text
    • https://site-1177298.mozfiles.com/files/1177298/recorder_karate_songs_with_letters.pdfIn PDF document text
    • https://zexunipubu.weebly.com/uploads/1/3/4/8/134877105/vifupagovok.pdfIn PDF document text
    • https://jipubegu.weebly.com/uploads/1/3/1/0/131070098/a91cb.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/tomaxade/96380292432.pdfIn PDF document text
    • https://s3.amazonaws.com/nagev/97047875247.pdfIn PDF document text
    • https://s3.amazonaws.com/vexeliku/xanufivebin.pdfIn PDF document text
    • https://s3.amazonaws.com/zuses/zovupegak.pdfIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/53834815517.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/syllable_structure.pdfIn PDF document text
    • https://s3.amazonaws.com/wulagisi/volume_and_surface_area_of_cylinder_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nokiva/printable_blank_game_board_templates.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_off0000d0a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0A4 5156 bytes
SHA-256: a417fa598dde238f15b264374a9f690cf9f7484e1e206d3941134fefc7e8dcb6
font_01_sfnt_off0000e249.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE249 10292 bytes
SHA-256: db9aac03cd0f7f3a3918f6ed340d1b82961b245c5c53e3a595c7ba0721ae3674

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