Malicious PDF — malware analysis report

Static analysis result for SHA-256 104844e4a5a41353…

MALICIOUS

PDF

74.1 KB Created: 2021-02-22 20:41:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 370571bc894d636a6ac7bcd0234a6ad3 SHA-1: ba0c7071df8c412a7f3dddfdc45abecd0eb6a5fc SHA-256: 104844e4a5a41353f1128600c07881eb01e1ce51d190a6a4bdbff5fbf77fb615
126 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous embedded URLs, with one prominent link leading to 'seumenha.ru' and a deceptive query parameter suggesting a lure related to thermostat programming. The PDF also exhibits characteristics of a link farm on disposable hosting, further supporting a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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/strik?utm_term=how+to+program+a+honeywell+thermostat+for+heat PDF link annotation
    • https://zodosixuwe.weebly.com/uploads/1/3/4/8/134863902/fikexa.pdfIn PDF document text
    • https://cdn.sqhk.co/bomumuxa/hhjjiaq/round_corner_visiting_card_mockup.pdfIn PDF document text
    • https://cdn.sqhk.co/wanoposuj/blg8Wgh/67467525499.pdfIn PDF document text
    • http://butijimixuf.iblogger.org/xofafotuxemexawegetusa.pdfIn PDF document text
    • http://gobigs.space/nightside_of_edenbpckl.pdfIn PDF document text
    • https://cdn.sqhk.co/feguzuvubut/idgcnSy/48285219069.pdfIn PDF document text
    • http://fowironomuk.iblogger.org/fudaruxo.pdfIn PDF document text
    • http://remontnatali.ru/save_the_earth_t_shirt_liza_koshy37ebu.pdfIn PDF document text
    • http://tefosewun.22web.org/64246624158.pdfIn PDF document text
    • http://rutopadazemed.22web.org/wordpress_blog_page_template.pdfIn PDF document text
    • https://tatonipek.weebly.com/uploads/1/3/4/8/134874136/b455b73ca70.pdfIn PDF document text
    • https://buniburus.weebly.com/uploads/1/3/1/6/131637527/d8fedcc95fb54.pdfIn PDF document text
    • http://dombitarf.ru/first_day_of_school_hillsborough_county_2021402pl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lesiterifok.epizy.com/florida_collections_textbook_answers_7th_grade.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_off0000e59a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE59A 5468 bytes
SHA-256: be802c4e27155620db3852822639f6eaaf7a450fba827945a23e14221db1eff3
font_01_sfnt_off0000f826.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF826 10232 bytes
SHA-256: 6682a27a949d7b080df7b3f82ae8b4d66143307813e61a303c8cf09b9726df39

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