Malicious PDF — malware analysis report

Static analysis result for SHA-256 3d2e48e2a0df4291…

MALICIOUS

PDF

76.9 KB Created: 2021-01-13 16:20:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 7d387c73987cb1edeb90ccfb09a10af7 SHA-1: e25e06766b655ca0f037e27afffe5dbfd31eba8f SHA-256: 3d2e48e2a0df42918266e74e85b4e0e8d2678457854f4e0437318ea05d775dc2
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan threat. It contains numerous external URLs, with a high heuristic indicating it functions as a link farm on disposable hosting. While no scripts were extracted, the presence of embedded URLs and the overall structure suggest an attempt to redirect users to malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://traffine.ru/123?utm_term=shooting+bench+design+ideas PDF link annotation
    • https://site-1173706.mozfiles.com/files/1173706/console_application_windows_forms.pdfIn PDF document text
    • https://cdn.sqhk.co/xeliwiwogivo/6Qnicji/jojiru.pdfIn PDF document text
    • https://site-1168031.mozfiles.com/files/1168031/72527574563.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375339/normal_5fbe7190698ab.pdfIn PDF document text
    • https://site-1166749.mozfiles.com/files/1166749/zenobuwabamab.pdfIn PDF document text
    • https://bexepusukanuv.weebly.com/uploads/1/3/4/7/134775428/xuwolewese.pdfIn PDF document text
    • https://cdn.sqhk.co/mavozopofug/jiaQEjd/99407860948.pdfIn PDF document text
    • https://site-1175359.mozfiles.com/files/1175359/soccer_management_game_apk.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vososasoxumete/halloween_word_search_worksheets.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e3b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3B0 5104 bytes
SHA-256: 7c6fbcb6abd1931f1fbf44ae1b824488e893feee39d16be0c1eef6406e202d32
font_01_sfnt_off0000f4f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4F7 10440 bytes
SHA-256: 39803d6cd18f2d55ce42a19519b0e8f1c7c55107610d58520e19ff3de0897617
font_02_sfnt_off000118db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118DB 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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