Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2fe9406878c145d…

MALICIOUS

PDF

84.8 KB Created: 2021-05-03 20:47:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: fcec48f7d1facf1ca995baf0136692dd SHA-1: 20f07d5589dd780cf1a11c44b29c4d5fb690b0e0 SHA-256: c2fe9406878c145d7fbf8bde3610d51f0c0eea35a536470f6b0128fee48be69f
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous external links, identified as a link farm, with one URL pointing to a suspicious domain. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO manipulation. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://midufefew.ru/strik?utm_term=excellence+el+carmen+vs+punta+cana PDF link annotation
    • https://cdn.sqhk.co/wemofisejaf/OmjhbYn/80836346789.pdfIn PDF document text
    • https://cdn.sqhk.co/wifukatar/iSt7Vgd/98052634937.pdfIn PDF document text
    • https://cdn.sqhk.co/lomasamube/jhhhhbk/build_a_bear_prices_harry_potter.pdfIn PDF document text
    • https://cdn.sqhk.co/joxonorapa/hdchijb/nolonowatolipoputu.pdfIn PDF document text
    • http://rukozhop-guide.com/appcrash_fixer_free4t9n9.pdfIn PDF document text
    • https://cdn.sqhk.co/subesanodag/ZIhcoii/smart_plug_tp_link_setup.pdfIn PDF document text
    • http://beamorem.com/25230241511i4kqk.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/df1ozje/joroluxarokijoxiwilu.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/dheJjja/circular_buffer_meaning_in_computer.pdfIn PDF document text
    • https://cdn.sqhk.co/dubikewe/14jccmH/epic_games_launcher_won_t_open_windows_8.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://18574fdc-dbe8-4f24-a3f7-ab3d6ff540e7.filesusr.com/ugd/d45bfa_04bf1ce8efa24fb48649132ce0ad3683.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7bae1c84-218a-4f47-ad3e-b1da195b179c/mercury_smartcraft_gauges_sc1000_manual.pdfIn PDF document text
    • https://1b3fde16-7575-45ba-b40e-8916c64185ca.filesusr.com/ugd/8874e8_8320845bd48c4a88bd92dc7ac8974939.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f01e20a-cc6f-4121-b180-4824e7735cac/18134119300.pdfIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_a2b65ad638424dc6b98a390c7d248553.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cb7589c-c7ff-4952-9845-02f62c732621/juloketuki.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_9855dacd4c734fb48a9175fc70f52247.pdf?index=trueIn 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_off0001029a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1029A 4888 bytes
SHA-256: fb8dcba659ec57ebfd269ae253326b2acc2882682db9fb907fceae149a3206a4
font_01_sfnt_off00011318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11318 10840 bytes
SHA-256: 3aa80eac9828f13121c2cb6089be11131b851d03de7acc4ba7d360bf63566430
font_02_sfnt_off00013778.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13778 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34

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