Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a8aa7cc5579357f…

MALICIOUS

PDF

64.5 KB Created: 2021-01-26 03:56:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 0ef41d6084a7debcdae6707d81fd5e53 SHA-1: 12c72b48f81c20a95164f8da49dccc8a160fec67 SHA-256: 9a8aa7cc5579357fdecc868764a9d030fd182bbfea8d835d3f2abf1e78f8c973
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, suggesting a link farm or SEO poisoning tactic. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external links are indicative of a malicious document designed to redirect users to potentially harmful content.

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
  • 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=dot+to+dot+21+worksheets+free PDF link annotation
    • http://letxxnx.org/yes_that_dress_game_online_freey37i5.pdfIn PDF document text
    • http://bestita.space/bitlife_life_simulator_reviewrgr7t.pdfIn PDF document text
    • http://yourdesk.website/classifying_numbers_venn_diagramy8mfm.pdfIn PDF document text
    • http://thesimplycompleteseries.com/photo_editor_free_app_download_for_pc6ur8o.pdfIn PDF document text
    • http://instup.xyz/lebara_mobile_data_settings_iphoneo3qpj.pdfIn PDF document text
    • http://studyweb.site/1000_words_text_examplef8b7k.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387410/normal_5ffc844aa09ab.pdfIn PDF document text
    • https://xajakubadom.weebly.com/uploads/1/3/0/8/130874473/994e3f03f6c73b.pdfIn PDF document text
    • http://armlur.space/werewolf_syndrome_imagesf9urt.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/farowug/treatment_guidelines_for_lymphatic_filariasis.pdfIn PDF document text
    • https://s3.amazonaws.com/piradi/historical_map_lexington_and_concord_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/baxegezivumi/78395484094.pdfIn PDF document text
    • https://s3.amazonaws.com/jasadavebaga/43304364099.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_off0000bfef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBFEF 5092 bytes
SHA-256: 201c5307dfdc87443836df924160ac21aa14440063d9706e6dfd7acfd4bc6923
font_01_sfnt_off0000d164.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD164 10612 bytes
SHA-256: 6f792cc45f43842c7f320b0a0ec99b9a123abe65e44270411e998ac0c2a9723c

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