Malicious PDF — malware analysis report

Static analysis result for SHA-256 275e8b1e5fe74a6f…

MALICIOUS

PDF

88.0 KB Created: 2021-05-04 09:23:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e765ef4e67ac8e6acbe99580ea762d66 SHA-1: 8544074384538f29c5ad62a293d8c3ade8d22f52 SHA-256: 275e8b1e5fe74a6f107bb61a236b1386b7c9cb8482fb436b59cc2db9996c34c9
164 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a link farm, suggesting an attempt to manipulate search engine results or host malicious content. ClamAV detected this file as Pdf.Phishing.Trojan, and ML classification yielded a high probability of maliciousness. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pelibifir.ru/strik?utm_term=thinking+maps+templates+pdf
    • https://nakigere.weebly.com/uploads/1/3/4/6/134608851/5064265.pdf
    • http://repair-monokoles.ru/83366190939ylxdf.pdf
    • https://sajenaviwabawi.weebly.com/uploads/1/3/4/2/134266368/jakutezefule-pixodunusolobaf-jokafadavawedem-zoralab.pdf
    • https://vidulegu.weebly.com/uploads/1/3/4/8/134897898/napujibin-tedeguwejemiwuw-vepefa.pdf
    • https://cdn.sqhk.co/norowitidot/hfhcMhi/kiki_layne_the_old_guard.pdf
    • http://myluckybet.xyz/85506853068g8zyj.pdf
    • https://cdn.sqhk.co/pumapajewa/didOEtv/doraemon_adventure_game_apk.pdf
    • https://cdn.sqhk.co/wowubumopem/fDghwgj/functions_of_all_electronic_components.pdf
    • https://cdn.sqhk.co/kolazapikib/iakhjb4/64843667996.pdf
    • https://fakebomazeb.weebly.com/uploads/1/3/1/4/131453402/4cda8cad6b9.pdf
    • http://negozio50sconto.info/calculus_early_transcendentals_2nd_edition_by_briggs__cochran_addison-wesley_20154un8t.pdf
    • https://cdn.sqhk.co/wazikunal/idegfY2/43201067444.pdf
    • https://cdn.sqhk.co/livefivepa/FdeiixN/toca_life_after_school_free_download.pdf
    • https://votopugukoz.weebly.com/uploads/1/3/5/3/135315446/faa8fdf95e1f7.pdf
    • https://gobebirerelimi.weebly.com/uploads/1/3/4/6/134651667/9435278.pdf
    • https://cdn.sqhk.co/doxelatofon/jjjhhgD/happy_teachers_day_greeting_card_images.pdf
    • http://leree4.club/nudebibejikejifeoc7fn.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_df2d5fda3f794a75b87f4466b9a5a9d6.pdf?index=true
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_6b674672d0dd44cc885cad85f9bfbd0e.pdf?index=true
    • https://36c7e617-1221-4173-b726-d5bce2878801.filesusr.com/ugd/610d21_1cd587d1fc6a43afb0775009285b614e.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011b5d.bin
0f6c0e65574c03e0ad9e22623e6cfcd4eeee09dede936793b7179d80a6488fbd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5D 5372 bytes
font_01_sfnt_off00012d80.bin
4d9965e8a0d96a23de489a740cc6f972f554b4e2c5915a8a457a5843831a8032		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12D80 10944 bytes

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