Malicious PDF — malware analysis report

Static analysis result for SHA-256 86ada9dbc15a3d09…

MALICIOUS

PDF

71.2 KB Created: 2021-02-28 22:07:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-07
MD5: c38262cb71d88581aea37157616376c0 SHA-1: 31f96f506190623c130cb56a611afb71375a2bc7 SHA-256: 86ada9dbc15a3d094175e9a654b56eaa270389a618d2365940aa09f46e725152
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, many hosted on disposable domains, suggesting a link farm or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata related to wkhtmltopdf and a search keyword, reinforcing the idea of a lure to external content.

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://nipisod.ru/award?keyword=tappan+range+oven+igniter PDF link annotation
    • https://dofemavuxowag.weebly.com/uploads/1/3/0/7/130739836/2155287.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/sample_high_school_biology_lab_report.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/29750342304.pdfIn PDF document text
    • http://antinomi.design/34900111309cinuq.pdfIn PDF document text
    • https://jeximikukadolo.weebly.com/uploads/1/3/1/6/131636734/96c1e6503fd1.pdfIn PDF document text
    • https://mamufitixiru.weebly.com/uploads/1/3/4/6/134640278/0ac5121ed.pdfIn PDF document text
    • http://baliferifopiz.mypressonline.com/dixetazisazux.pdfIn PDF document text
    • http://zekaxezixil.medianewsonline.com/ipad_mini_2021_refresh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387230/normal_5fd1801187f9d.pdfIn PDF document text
    • http://ericksandoval.com/37055750936s0kh.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/pezofut/letter_p_activity_sheets.pdfIn PDF document text
    • https://s3.amazonaws.com/wifukedot/uptet_answer_sheet.pdfIn PDF document text
    • http://piwolimosopobu.myartsonline.com/autocad_2019_free_trial_mac.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_off0000dbc0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBC0 4784 bytes
SHA-256: 16fd0f8451ffb494e60fd4e27cc584913da07cf27fc866fb195292f15024a45f
font_01_sfnt_off0000ec24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC24 10572 bytes
SHA-256: 224cf1e9ecaa756195f9946fa756880636c75062247f40d33e225bcd791ef63e

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