Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a23a1b0601a73f…

MALICIOUS

PDF

69.4 KB Created: 2020-12-17 20:41:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 3af239f16a6211cb2e356d05118f4a06 SHA-1: b38751f6994fc76944f08da667ae54bdbcb3201c SHA-256: 90a23a1b0601a73f1af046399daffecfdc9f19631334b5661f5ac0b4ffda17fd
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, many of which point to external PDF files, suggesting a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure. The document body, though heavily obfuscated, appears to contain text related to a recipe, likely a lure. No scripts were extracted from this sample, but the presence of numerous malicious links indicates a phishing or malware distribution attempt.

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/strik?utm_term=chelsea+buns+recipe+nz In PDF document text
    • https://cdn-cms.f-static.net/uploads/4478683/normal_5fd869b54fef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4462376/normal_5fa54667c0db4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450514/normal_5fa06a42bbd6d.pdfIn PDF document text
    • https://bomikuwutivibi.weebly.com/uploads/1/3/4/5/134598741/3880040.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452861/normal_5fa83913604fe.pdfIn PDF document text
    • https://xeludelibiw.weebly.com/uploads/1/3/4/3/134371965/589109.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/wazagidonux/five_letter_word_start_with_i.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbf6af49d79364840868fb2/1606380276368/what_is_tft_temperature.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc17edd6609fd0ee7958e2c/t/5fcf650f14319a51dc311fc6/1607427344602/vr_horror_3d_video_download.pdfIn PDF document text
    • https://s3.amazonaws.com/mogedozara/guide_d_installation_archlinux.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_off0000c7ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7EE 4928 bytes
SHA-256: 68cf809fbbbde2b0b7bc80ccd065999f88986d50cb8a94cf9d9696c518c00820
font_01_sfnt_off0000d891.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD891 9928 bytes
SHA-256: fecd1cdfe2dd7e9ca9bbb4472b913756c36a442f12137c9003bc5645d5ba48b6
font_02_sfnt_off0000faa3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAA3 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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