Malicious PDF — malware analysis report

Static analysis result for SHA-256 d61986b0a74f7c8a…

MALICIOUS

PDF

73.3 KB Created: 2021-02-19 01:53:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 7e67ed2657fa58cf4b20e9bbce24476a SHA-1: c541b85a01befeea2f3a777c4ec3231b36b0fcc3 SHA-256: d61986b0a74f7c8a3514bb1a348ead379b9ff7999aaaf6d7ad1106d3ac76943d
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate the document is a link farm designed to direct users to potentially harmful sites, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to exploit user interaction for malicious purposes.

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://yafferge.ru/strik?utm_term=best+r+programming+book+for+beginners+pdf In PDF document text
    • https://static.s123-cdn-static.com/uploads/4386081/normal_5fe59ca54725a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376629/normal_601958495b6e0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393925/normal_5fd87fdc7b418.pdfIn PDF document text
    • http://bobiruropiles.22web.org/unsuccessful_job_application_template.pdfIn PDF document text
    • http://nadixonoju.iblogger.org/vojolaxakaxabaroguromori.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5ff5a8ef4a19e.pdfIn PDF document text
    • http://abwaab.su/how_to_reset_voicemail_on_vtech_phoneyuryg.pdfIn PDF document text
    • http://ninufejuvosixir.22web.org/speed_queen_dryer_sh_error.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464530/normal_601fef22d142f.pdfIn PDF document text
    • http://bebosebe.66ghz.com/bwv_1055.pdfIn PDF document text
    • http://duvukawobuja.iblogger.org/civilization_5_leaders_guide.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujefozumuresul.epizy.com/invitation_to_interview_letter_template.pdfIn PDF document text
    • http://tufuripisaren.epizy.com/femelunodirodedidokade.pdfIn PDF document text
    • http://lojetewope.epizy.com/audifonos_marshall_major_ii_bluetooth_manual.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_off0000e0ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0EF 5584 bytes
SHA-256: d43225d18d2ebd4907b0a0a999d212f1b09a0f6f14e97f985855e6d057c716d0
font_01_sfnt_off0000f3da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3DA 10656 bytes
SHA-256: 29f5cb792f7a5e94f83259e19973a29b3eee9be54857be96960d7f73f9beb287

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