Malicious PDF — malware analysis report

Static analysis result for SHA-256 8bd711a6172041a1…

MALICIOUS

PDF

75.2 KB Created: 2021-03-14 11:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 555ec33da1d7a4b0c7a30e3cd56e1192 SHA-1: 99d305a48fcd9f0ec803db73522aefe9709ab309 SHA-256: 8bd711a6172041a1b7a4acf65e8f586a3b00a64bd54bac7a9f4f4a92dcf427e0
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with the primary purpose of directing users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous URLs suggest an attempt to exploit user trust by providing a seemingly legitimate document that redirects to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=d%2526d+3.5+eberron+campaign+setting+pdf PDF link annotation
    • http://lowufadit.scienceontheweb.net/jusudu.pdfIn PDF document text
    • https://malomunadososep.weebly.com/uploads/1/3/5/3/135351096/5813440.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/isometric_drawing_autocad.pdfIn PDF document text
    • http://xixofafil.medianewsonline.com/atomos_shogun_7_manual.pdfIn PDF document text
    • http://clyb-wylcan3.space/cu_boulder_application_deadline_transferxvq4l.pdfIn PDF document text
    • https://semanipiji.weebly.com/uploads/1/3/5/3/135312460/3d19d5a3d5.pdfIn PDF document text
    • http://furniture21.online/how_to_exercise_with_dumbbell363si.pdfIn PDF document text
    • https://dawemewi.weebly.com/uploads/1/3/4/7/134747996/xivif_fedominu_pawamizobirireb_nutok.pdfIn PDF document text
    • http://all-system7.xyz/japibubuvowupoxivobaziv5zrv.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/sedowedi/blink_home_camera_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/wizuluworafid/canon_pixma_ip100_instruction_manual.pdfIn PDF document text
    • http://besafetusupug.atwebpages.com/bhagavat_geetha_tamil.pdfIn PDF document text
    • https://c8a164a7-2549-4056-b209-d27d417f800b.filesusr.com/ugd/136d3d_38122846650e4d5fba0925d57f107c0f.pdf?index=trueIn PDF document text
    • https://09ec9d85-9312-4337-94d0-b84080e05f2e.filesusr.com/ugd/ac0094_2511c25a8c0d4a06ba760f128ac595d6.pdf?index=trueIn PDF document text
    • https://3dcfbd4a-ef33-49dc-a04a-0aaf5307c30d.filesusr.com/ugd/b47706_5b41e0e3b7eb4fc8a6e040a22e13bf58.pdf?index=trueIn PDF document text
    • http://rujidafedisezu.atwebpages.com/wekeginogizipovugugeviluv.pdfIn PDF document text
    • https://s3.amazonaws.com/vovuzize/bombay_tamil_movie_songs_starmusiq.pdfIn PDF document text
    • https://s3.amazonaws.com/geraromu/manualidades_para_vender.pdfIn PDF document text
    • https://s3.amazonaws.com/palevijuj/dekujavowofagur.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_off0000ec65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC65 4156 bytes
SHA-256: bb1702a9e9b617346157f9ea6f36cc14559c37d4a4a2cf683ebd57dce9d2c082
font_01_sfnt_off0000fa94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA94 11376 bytes
SHA-256: 27667d338a46954a1d1bef6ad5776daf6da6f4c71db424afdea2e0d3de5a0156

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