Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd30513aaac255cb…

MALICIOUS

PDF

72.4 KB Created: 2021-02-26 04:13:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 58e1bea39ad401e4999da2e28a377aae SHA-1: 9cbdf0f074b6d10508e6f133061154862e7f325b SHA-256: cd30513aaac255cb55af39736c77da206fa89fa792ae5684d6326fb7fe70dbc0
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF. It contains multiple embedded URLs, including one pointing to 'seumenha.ru', which is likely a phishing or malware distribution site. The PDF's structure and embedded content suggest it's intended to trick users into clicking these links, aligning with a spearphishing attachment attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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/strik?utm_term=blue+bossa+guitar+tab PDF link annotation
    • https://cdn.sqhk.co/pasivuzuke/b2hhveO/joxonud.pdfIn PDF document text
    • https://cdn.sqhk.co/devurekon/nQhjmje/58726875275.pdfIn PDF document text
    • https://roginolesalit.weebly.com/uploads/1/3/1/6/131636974/kurejidenukipagogovi.pdfIn PDF document text
    • https://cdn.sqhk.co/sabiwizi/ejgvtii/15170546237.pdfIn PDF document text
    • http://nigoviwan.22web.org/3836575951.pdfIn PDF document text
    • https://nagiwudulowep.weebly.com/uploads/1/3/0/7/130775657/suwuveloxipux.pdfIn PDF document text
    • http://jotewelife.iblogger.org/google_spreadsheet_add_dropdown.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gikukenal.rf.gd/bidejawovilofejogesuto.pdfIn PDF document text
    • http://sedejavuguz.rf.gd/lined_notebook_paper_word_template.pdfIn PDF document text
    • http://tixiwepire.epizy.com/planilla_alta_complejidad_ioma.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/33022022190.pdfIn PDF document text
    • http://walaveb.rf.gd/employee_performance_evaluation_templates_free.pdfIn PDF document text
    • http://dujawupiraxep.rf.gd/importance_of_job_description_in_hrm.pdfIn PDF document text
    • http://dimebuturerab.epizy.com/34770005077.pdfIn PDF document text
    • http://befokube.rf.gd/webojozebovagugivoxami.pdfIn PDF document text
    • http://lawuzuzadi.rf.gd/adobe_xd_for_windows_7_free.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_off0000ddd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDD0 5044 bytes
SHA-256: 2a56b967705e71f33553af003c4211622a27ec184a35de6ad1f6d8b717600205
font_01_sfnt_off0000ef06.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF06 10948 bytes
SHA-256: 0d5713354f5371e38d07342fc61b8de5823fb147c5a68f0e28be987fcdd1f281

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