Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf2c87b4983e7db4…

MALICIOUS

PDF

68.0 KB Created: 2020-11-26 07:20:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 20d101953df502012259ce89243efaea SHA-1: 27cddaea4b3571e7307c587dceb5d65eb858af48 SHA-256: bf2c87b4983e7db46d14eaa9d95ff2970d199946518af8dab484d0cdd2a94fe5
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://gettraff.ru/123?utm_term=numerical+analysis+burden+faires+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4465249/normal_5fbc603a21fdf.pdfIn PDF document text
    • https://gavawujag.weebly.com/uploads/1/3/4/3/134370084/6706095.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528780/normal_5fb39ca36b9de.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/pazerogasarinu/gal_meets_glam_charleston_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/subud/65711971602.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8992b482-2369-4034-a3a6-a188bf29cbaa/physioex_9.0_exercise_3_review_sheet_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/pajukovuxetu/action_verbs_vocabulary_matching_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/java_jre_8_windows.pdfIn PDF document text
    • https://s3.amazonaws.com/rafiralexezol/classroom_behavior_chart_template.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/yogi_bear_theme_song.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ba89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA89 5204 bytes
SHA-256: a3c73734631188511e03ad7f01e0a6fb2bfa844b4b79f5e48c254ee07902cd55
font_01_sfnt_off0000cc16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC16 12676 bytes
SHA-256: 12974eb91c0f5a2d8c532cd836d89d98b6d29a348f0c86030fb92ea50b6bbc57
font_02_sfnt_off0000f55d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55D 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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