Malicious PDF — malware analysis report

Static analysis result for SHA-256 71f60806f9003429…

MALICIOUS

PDF

70.3 KB Created: 2021-09-29 03:44:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 41d2f868c85364c7b9114325c2e7fa92 SHA-1: c5a659f070a9b1eedf37471a9003a123bb6aab12 SHA-256: 71f60806f9003429963b858979951f1c369133a0997123440ad6399c2ddcf890
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's designed to redirect users to potentially harmful sites. No scripts were extracted, but the structure and numerous unknown URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://phm.vn/upload/files/44252976047.pdf In PDF document text
    • https://unovosti.tv/ckfinder/userfiles/files/71950664059.pdfIn PDF document text
    • http://sanphamhanquocymy.com/uploads/files/37259170339.pdfIn PDF document text
    • http://superlitefan.com/uploads/files/boxusawexinisiti.pdfIn PDF document text
    • https://edinburghpools.com/contents/files/jazofixipalupo.pdfIn PDF document text
    • https://novsport.com/content/File/fuxejidunajubinabomotes.pdfIn PDF document text
    • http://indiebookoftheday.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae63eb973a---8221396715.pdfIn PDF document text
    • https://smsenerji.com/resimler/files/wawixateniwavuj.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/13697296510.pdfIn PDF document text
    • https://vestol.bg/files/file/31780825504.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/vurado.pdfIn PDF document text
    • http://audiencefertilization.com/fckeditor/editor/filemanager/connectors/php/userfiles/file/98633150573.pdfIn PDF document text
    • http://www.guaitoli.eng.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613fb11348849---78837729098.pdfIn PDF document text
    • https://optimuselearningschool.com/learning/site/images/uploadfiles/65138470889.pdfIn PDF document text
    • https://tsolisp.com/files/file/56551956419.pdfIn PDF document text
    • http://omni-links-europe.com/images/blog/file/97590457483.pdfIn PDF document text
    • http://kcde.kr/userfiles/file/84231953818.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210913_3DCAA126841D582C.pdfIn PDF document text
    • https://www.studioline.ie/ckfinder/userfiles/files/7633660463.pdfIn PDF document text
    • https://esperidiaogomes.com/userfiles/files/suxasilivezezumafirosut.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/54666573015.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/sisemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=two+types+of+reflection+of+lightPDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CB 10760 bytes
SHA-256: 88e9b1bca7371278eb24d8258b88d4d851ee47f1645ccfaf63ea0a5245368c9e
font_01_sfnt_off0000c99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC99D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e1af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1AF 16484 bytes
SHA-256: 136aa9590c8ee98dcb4a19a1bba20a960d7c2cfb191b0d4f6a9d07adc87236ad

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