Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b0b38de59a7eac1…

MALICIOUS

PDF

74.3 KB Created: 2021-01-14 21:08:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: adb98654a9731e195260a793d69d5820 SHA-1: 616b76814d642e89c5b89498ec443a25f7c8d51b SHA-256: 4b0b38de59a7eac164a7c98eddd530b3178bec0bdd80bd971591a8a11e5204a4
234 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file is identified as malicious due to its inclusion of numerous external links, many of which point to redirector infrastructure and potentially malicious content. The heuristic firings indicate it functions as a link farm and contains a malicious redirector, suggesting an attempt to lead users to phishing sites or download further malware. The presence of a callback lure heuristic further supports a phishing or scam-related attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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/123?utm_term=boston+fire+credit+union+mortgage In PDF document text
    • https://cdn.sqhk.co/gikasiful/fgdid9h/pop_music_mix_2019_mp3_download.pdfIn PDF document text
    • https://cdn.sqhk.co/pivokazi/FRmiigf/bipopowulojo.pdfIn PDF document text
    • https://rabifupokuwu.weebly.com/uploads/1/3/1/1/131164250/ronununase.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409103/normal_5fb5bc211923f.pdfIn PDF document text
    • https://riwetomawojok.weebly.com/uploads/1/3/4/5/134516188/xivekobeju-pudarudapuvima-jamelurafusumu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393521/normal_5fd5f137c41ed.pdfIn PDF document text
    • https://cdn.sqhk.co/zibusisujij/Ygf3RTc/polovivinodogumabuma.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369512/normal_5f8b0e99b523c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_5fa3f068dec0d.pdfIn PDF document text
    • https://lekekupoj.weebly.com/uploads/1/3/4/5/134513515/1181299.pdfIn PDF document text
    • https://cdn.sqhk.co/dofexoxev/zMjh24s/zowozuxulafafelisebe.pdfIn PDF document text
    • https://guxofoxevi.weebly.com/uploads/1/3/4/7/134737998/8370099.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403556/normal_5f9236fb83d04.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e611.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE611 5360 bytes
SHA-256: 830b19fb2a6fa8e0becbe03b89648e701c059067baa0ffe929c2d56f7aae7d45
font_01_sfnt_off0000f833.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF833 10616 bytes
SHA-256: 808cc2bbfe04ce75f9c54d232264b3620fd62607adf9655e9ef657263889daa3

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