Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc9330e3c25652a3…

MALICIOUS

PDF

71.9 KB Created: 2021-01-02 12:11:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: c94559f9838c0afdc7dab130b9cc7331 SHA-1: e86c8f453703ca540202eb61bf7516846186ec5b SHA-256: dc9330e3c25652a3b4d3078b0c42e72f798bfc57e83294ac946cb33d606b746b
156 Risk Score

Malware Insights

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

The PDF file contains numerous embedded links, with a significant heuristic firing indicating a 'PDF_SEO_LINK_FARM' that points to a large number of external PDF files. One of the primary external URIs, 'https://trafffi.ru/aws?utm_term=azar+grammar+pdf++free', suggests a phishing or malicious content lure. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafffi.ru/aws?utm_term=azar+grammar+pdf++free PDF link annotation
    • https://cdn.sqhk.co/kepilujofeje/cQzVfij/inside_out_sadness_and_joy_fanfiction.pdfIn PDF document text
    • https://ruregojuze.weebly.com/uploads/1/3/2/8/132814589/8507895.pdfIn PDF document text
    • https://cdn.sqhk.co/zusisoko/Ijjgjgd/xidapujojesa.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/tomamujuf/megobadepidixadotujakemo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c35db940-b207-4f9e-9dee-97f2d73b74e7/88599035604.pdfIn PDF document text
    • https://s3.amazonaws.com/lokijuronig/22119294070.pdfIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/personal_interview_evaluation_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/nitatotol/indian_platform_singer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7113b42e-9554-42a6-bf56-0e1544be06ce/39354869806.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1effb647-5d40-4ea0-9696-d46bc4f07bed/jitojuzugofut.pdfIn PDF document text
    • https://s3.amazonaws.com/tifuwuw/blend_worksheets_for_2nd_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/gubijofakofafeviro.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/car_wala_game_apps.pdfIn PDF document text
    • https://s3.amazonaws.com/perurulexi/bollywood_video_song_websites.pdfIn PDF document text
    • https://s3.amazonaws.com/rezugekolaba/pathogenesis_acne_vulgaris.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/sarkari_exam_up_police_answer_key_2019.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_off0000d232.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD232 5192 bytes
SHA-256: ece23dcd37663338cc0d66ba5e0e48ecf1c06a0455ea7ec9881c107959619124
font_01_sfnt_off0000e3d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3D4 14480 bytes
SHA-256: b4ae1fd03e9d26cc916a1331eb750495b8909ac78950a01dd9c177f45e94043e

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