Malicious PDF — malware analysis report

Static analysis result for SHA-256 61dbb0960ce82415…

MALICIOUS

PDF

70.7 KB Created: 2021-01-22 05:20:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 42df30f9b4253f3d2f3ec1755b71376e SHA-1: 9fef167a9e60da041c152c63b12067444d097e30 SHA-256: 61dbb0960ce8241543d6df8e09432776ab8364b582771cfbbc4074fd9b8c674b
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure strongly suggest an attempt to redirect users to malicious content, likely involving JavaScript execution within the PDF.

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
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://seumenha.ru/123?utm_term=creative+study+guide+template PDF link annotation
    • https://cdn.sqhk.co/jozazixefuf/higicie/character_writing_prompt_generator.pdfIn PDF document text
    • https://cdn.sqhk.co/romilononove/fHQKE6R/30937498388.pdfIn PDF document text
    • http://xolimaked.iblogger.org/d-_link_dgs-_1210-_28p_datasheet.pdfIn PDF document text
    • https://cdn.sqhk.co/dederubap/bQhdQWd/lozojanuvixigibalif.pdfIn PDF document text
    • https://cdn.sqhk.co/kapudome/0wajeih/24481009062.pdfIn PDF document text
    • https://cdn.sqhk.co/wedegetuso/ij0jeid/62494670132.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rafodize.rf.gd/lutawawadurazefakidam.pdfIn PDF document text
    • http://pibanifadedo.epizy.com/muvofabovax.pdfIn PDF document text
    • http://femejedad.epizy.com/guide_touristique_finistere_nord.pdfIn PDF document text
    • http://xokofenox.epizy.com/chsl_answer_key_2019_free_job_alert.pdfIn PDF document text
    • http://deketinak.rf.gd/25903300160.pdfIn PDF document text
    • http://wekidezeze.epizy.com/jiretitewonilupu.pdfIn PDF document text
    • http://vikogen.epizy.com/kayarian_ng_pangngalan_worksheets_grade_3.pdfIn PDF document text
    • https://s3.amazonaws.com/samopakamefap/free_html_email_footer_template.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d850.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD850 5344 bytes
SHA-256: 3d5f7c8a145d8a2c8106ee17f172da5b4ac84c1b8093f04bf243ff90f47fb7be
font_01_sfnt_off0000ea72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA72 10352 bytes
SHA-256: a9fceac124465848d3de5f9577e00fc3b7ad3ba004a3ab5ff5e5ddd95fac389b

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