Malicious PDF — malware analysis report

Static analysis result for SHA-256 04b2e86d95c8de44…

MALICIOUS

PDF

70.3 KB Created: 2020-11-25 12:49:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: abdf9eca347af9beb401d9950bdbfcc0 SHA-1: b182293f583d56472cfb31fef457fcf413535cb7 SHA-256: 04b2e86d95c8de44dc608de9713445dc41717c7a8bb99708bbe40de5ff8af0bf
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of embedded links, with one identified as a known malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body is heavily obfuscated, but the presence of numerous external links suggests a phishing or link-farming attack pattern designed to lead users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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/strik?utm_term=juegos+grupales+para+jovenes In PDF document text
    • https://fatagodudun.weebly.com/uploads/1/3/4/3/134327877/0f25b26630a0368.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366036/normal_5f871a8517be3.pdfIn PDF document text
    • https://tagagenefesogi.weebly.com/uploads/1/3/4/8/134864131/9325926.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370097/normal_5f8afe974e4ac.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451736/normal_5fa44d8eee964.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_5f95cc362119b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369772/normal_5f958f9d402d1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389080/normal_5fb50c9799391.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4447089/normal_5fbde9305a423.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410954/normal_5f94dbb47cc21.pdfIn PDF document text
    • https://vebaxifi.weebly.com/uploads/1/3/4/3/134360040/6224262.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ff768f7-9f1a-4e71-95ee-85b6257e071d/7259891864.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/095b946c-5bda-4baa-91e7-7fb4ec92f0b9/anonymous_se_lhe_cai_a_mascara_versi.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_off0000d5b3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5B3 5112 bytes
SHA-256: a8a0ca87ab624fc4153301293994f30dfc7aeb8d8bab59f684efc19c57759018
font_01_sfnt_off0000e735.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE735 11108 bytes
SHA-256: 0eadaa010a70a52f878e54a1ef725dc381f8879ce16be73726d52506fe48aac4

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