Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fa66541e8ea93af…

MALICIOUS

PDF

71.0 KB Created: 2021-02-14 11:28:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: c8622edf34b896c55a7ef2494ca8908b SHA-1: 7097387f55bc5cbd6d352066d402e3c95186c3e0 SHA-256: 3fa66541e8ea93afd2eeeb405a1b9794eb577a9b983d9aab0e2d50fc155eaf1b
126 Risk Score

Malware Insights

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

The PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of numerous embedded URLs, many pointing to disposable domains and one specifically leading to a potentially malicious URL with UTM parameters, suggests a phishing or redirection attempt. The document body, though heavily obfuscated, contains fragments that might relate to product lures, further supporting a phishing pretext.

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=cree+t6+led+bulb PDF link annotation
    • http://realwockyc.info/22373152620wnk6q.pdfIn PDF document text
    • http://manekobe.22web.org/topolasonataxofazewijeb.pdfIn PDF document text
    • http://sqrab.top/30627795489006db.pdfIn PDF document text
    • http://kotumixevana.22web.org/fafuxifif.pdfIn PDF document text
    • http://klokisik.space/blue_chickens_stardew_valleyoljwu.pdfIn PDF document text
    • http://nubavawitaduder.22web.org/napemikarexogozer.pdfIn PDF document text
    • http://canonsburglake.com/antivirus_mac_free_gratis3bf6c.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nomapalugaji.epizy.com/board_meeting_minutes_template_for_llc.pdfIn PDF document text
    • http://parubixus.rf.gd/free_pleco_chinese_dictionary_for_pc.pdfIn PDF document text
    • http://dibesefar.epizy.com/utorrent_classic_for_windows_10.pdfIn PDF document text
    • http://pojevit.rf.gd/jutoja.pdfIn PDF document text
    • http://momerulazem.rf.gd/tupinope.pdfIn PDF document text
    • http://dotalikajulu.rf.gd/85616001814.pdfIn PDF document text
    • http://wozojatoxako.epizy.com/adobe_flash_player_free_for_android.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_off0000dc5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC5D 4632 bytes
SHA-256: f8a70cb0363452f81cab060424b774336a8a183b73b2b00fb203b11a7ddb1393
font_01_sfnt_off0000ec23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC23 10400 bytes
SHA-256: 1bedfd13eea2db203e8c8274d23abd78908856ac674353952215203e81699925

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