Malicious PDF — malware analysis report

Static analysis result for SHA-256 16c9b455cc904e2d…

MALICIOUS

PDF

74.4 KB Created: 2021-02-26 03:40:29 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: bd151c2296855b2db49db4c00dbecc7d SHA-1: d9e2616c792736ce24be453212dc19cad093886a SHA-256: 16c9b455cc904e2ddcfa5afc50d8ea634d53ab1e522bbaa9b262e799ac847e34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file is identified as malicious by ClamAV and an ML classifier, and contains numerous embedded links. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates that the PDF is a link farm on disposable hosting, suggesting a phishing or spamming campaign. The embedded URLs point to various domains, likely intended to redirect users to malicious content or phishing sites.

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/award?keyword=how+to+write+a+good+synopsis+for+a+documentary PDF link annotation
    • http://austritkfa.com/ruger_air_hawk_elite_review67f4o.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450340/normal_5ffb8c17218e6.pdfIn PDF document text
    • http://powajaxib.medianewsonline.com/xogapewiwaparej.pdfIn PDF document text
    • http://newipufisatag.scienceontheweb.net/how_do_you_write_a_thesis_statement_examples.pdfIn PDF document text
    • http://lezigovedavide.getenjoyment.net/87587261331.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491688/normal_6001f04756918.pdfIn PDF document text
    • http://leledup.mypressonline.com/vizio_e601i-a3_apps.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4377704/normal_60073b2054341.pdfIn PDF document text
    • http://digitaltoolsfor.xyz/2007_tahoe_boat_owners_manualb5vxg.pdfIn PDF document text
    • http://rilomenininun.getenjoyment.net/happy_ending_movie_song_download_bestwap.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455902/normal_601f0ea9e5d56.pdfIn PDF document text
    • http://deemonatrafik.xyz/5879262456410mkm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471995/normal_600b4804e774a.pdfIn PDF document text
    • http://kumululurug.scienceontheweb.net/kavidano.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366000/normal_5fcbf1efe38a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4405903/normal_5fe46debbddc6.pdfIn PDF document text
    • http://tehnoprom.org/disubefak3je3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445733/normal_5fe25edb665f2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497695/normal_601092cd44c93.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e53c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE53C 5596 bytes
SHA-256: 23883ca0644f2802a1870eb1b07636e629f62787f8519567dde757f8cb790ef8
font_01_sfnt_off0000f852.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF852 10640 bytes
SHA-256: ed534ccfd9dec366dd43801624d4538bb2762b98ca250adac40a8778911fbdce

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