Malicious PDF — malware analysis report

Static analysis result for SHA-256 63cfb49d225434c6…

MALICIOUS

PDF

74.3 KB Created: 2021-01-21 20:39:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7d830d37eaeb6b0e3cac33722201d484 SHA-1: b90f75d0060264f8fca36fd0ab67bee99c8cf565 SHA-256: 63cfb49d225434c68879fd231991fe5ab37bc54768e6e670c6ac763ab5d2a2bb
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document contains a mass of external links, with one prominent example being https://leonvi.ru/123?utm_term=disney+paint+colours. This indicates the document's primary purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://leonvi.ru/123?utm_term=disney+paint+colours PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4452372/normal_5fc870608866d.pdfIn PDF document text
    • https://cdn.sqhk.co/zadorari/aXib4gg/history_of_rome_podcast_episode_1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385235/normal_5feda1ce2ec22.pdfIn PDF document text
    • https://cdn.sqhk.co/durotula/uegf0Y5/color_by_number_halloween_preschool.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451545/normal_60001af43c380.pdfIn PDF document text
    • https://cdn.sqhk.co/vudemijugamu/qididL0/32573188240.pdfIn PDF document text
    • https://cdn.sqhk.co/xarozowuzosa/52hfZdd/trick_shots_winter_park.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393035/normal_5fc8a0b76029b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413112/normal_5feaf93dcf456.pdfIn PDF document text
    • https://gijojipile.weebly.com/uploads/1/3/1/3/131381352/a4a4c.pdfIn PDF document text
    • https://warefoboba.weebly.com/uploads/1/3/4/6/134669172/8669217.pdfIn PDF document text
    • https://cdn.sqhk.co/majumoros/igihe4v/10638862849.pdfIn PDF document text
    • https://visopitolunew.weebly.com/uploads/1/3/1/4/131483219/zidegaloke.pdfIn PDF document text
    • https://zivotawab.weebly.com/uploads/1/3/4/5/134576919/mubefig_motag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393900/normal_5fd0d58f4dba1.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/lepefi/machine_learning_with_python_coursera_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tedowafomaru/angular_bootstrap_login_form_example.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/anari_audio_songs_free.pdfIn PDF document text
    • https://s3.amazonaws.com/libusamagowuvo/nutricion_parenteral_y_enteral.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/burerurinakafewak.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_off0000e6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6C3 5028 bytes
SHA-256: c42788fe6319c350cc70acbe78e658916f660b310bf11534dd969e37cfcb153d
font_01_sfnt_off0000f7f8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7F8 10616 bytes
SHA-256: 1c4d8630e542f4f62e890895fdf152026054d5527147a0bfda9776d529003d58

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