Malicious PDF — malware analysis report

Static analysis result for SHA-256 12cf509ffab44a6e…

MALICIOUS

PDF

76.4 KB Created: 2021-02-14 20:04:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: ec216d9430ac2a2fc5c0e79edc6650bd SHA-1: d58dfc1ea814085758fb62ede045a0ac18bbacc4 SHA-256: 12cf509ffab44a6ec738b89d27bac5097431d2d50c26abe1cb1dd469407f4503
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://druttle.ru/wix?keyword=factoring+putting+it+all+together+answer+key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418778/normal_600c744fa66d2.pdfIn PDF document text
    • http://lnstagram-badge-verification.com/adobe_premiere_pro_manual_free_downlyh7l7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390052/normal_5fe2ebbbb7489.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_5fdb9ef2a751d.pdfIn PDF document text
    • https://cdn.sqhk.co/wifavizen/ghheGWw/62786365467.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4492286/normal_5fdc741a3fd98.pdfIn PDF document text
    • http://scriptbook.xyz/spesifikasi_game_cyber_hunter_androidt9lb0.pdfIn PDF document text
    • https://nopubogap.weebly.com/uploads/1/3/4/6/134667077/5255194.pdfIn PDF document text
    • http://stonersfranchise.com/risk_analysis_methods_journalwyvdx.pdfIn PDF document text
    • https://cdn.sqhk.co/goworonol/kifhg1p/music_aerosmith_rock_n_roller_coaster.pdfIn PDF document text
    • http://shoop-ft.ru/tobar_36674_mini_remote_control_speed_boatfpm2j.pdfIn PDF document text
    • http://peludofnor.fun/vojasalawojunuxagaack01.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/xifabilejilab/74828866144.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

Related samples 5

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e00b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE00B 5292 bytes
SHA-256: 8f5058c92e94aafdb0bb551459a8b528e6459f274c8d5b2aeecc6fb39a68f67b
font_01_sfnt_off0000f216.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF216 10756 bytes
SHA-256: 27e90cf327034930ebd372b3338ce31939a012f97c581d4cfa2fdf75d183784d
font_02_sfnt_off000116af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116AF 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2

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