Malicious PDF — malware analysis report

Static analysis result for SHA-256 edb0068c15837f45…

MALICIOUS

PDF

78.8 KB Created: 2020-12-20 20:52:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-31
MD5: 9efaf8d708e97227dd12ff8476f2208a SHA-1: d9cc4273759301463f61c92894192484a93aff4c SHA-256: edb0068c15837f45d3323d09c5af696abf1ac29cf73b535a55c33dcc462e36a4
214 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to `https://ggtraff.ru/strik?utm_term=kim+jong+suk+drama`. This URL is likely used to lure victims into clicking on it, potentially leading to further malicious content or phishing pages. The presence of numerous other PDF links, identified as a link farm, further supports a malicious intent to distribute or redirect. ClamAV also detected this file as a phishing trojan.

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
  • 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://ggtraff.ru/strik?utm_term=kim+jong+suk+drama In PDF document text
    • https://cdn-cms.f-static.net/uploads/4371010/normal_5fa0c7e42c4ea.pdfIn PDF document text
    • https://mutakisutuw.weebly.com/uploads/1/3/4/7/134768563/3171987.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370285/normal_5fa4bde968fe9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://static1.squarespace.com/static/5fc080f7bf71053ccb0e3c67/t/5fc4e9acf8cdb769c67d4794/1606740396992/84443980734.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/mimecast_for_outlook_login.pdfIn PDF document text
    • https://s3.amazonaws.com/wunupalezozerud/ghost_adventures_episode_guide_2019.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/78e62c29-64b8-41a4-8d91-3f8523323fc3/wuwulaxin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/03f1e249-b625-43ae-87ad-3469643535c1/gezuzala.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/84628234786.pdfIn PDF document text
    • https://s3.amazonaws.com/bajapovogam/16403740242.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22d70893-58a5-4c0c-913f-9b1b147336f7/femilitugubofixumom.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dfe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE6 5224 bytes
SHA-256: 9fd1ff4ad3d884ed5a3939578c249d883b9ef7d596d1ddd28ec101099e026872
font_01_sfnt_off0000f196.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF196 12268 bytes
SHA-256: 28e054f72fa08f690b0b1696d96c0b2c1556b5018a976e9d2a3e5d818380e8ea
font_02_sfnt_off00011941.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11941 16192 bytes
SHA-256: 97eaff3b82c676f1abdbd0332319dec8e2a1e636cb4a45501d53b63e39e9f16d

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