Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ea95f97914d35ed…

MALICIOUS

PDF

122.3 KB Created: 2021-03-28 05:36:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3ee803be83fe7519f644270dceb552d9 SHA-1: bf9d0a80c441059355101be860b1ad676f284b40 SHA-256: 6ea95f97914d35edde73e2a8bfe8a69abfad4ca7523653eb4d90ab8cebfdec9a
156 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified as a link farm, which is a common technique for SEO manipulation or distributing malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it's designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9879

Heuristics 5

  • 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
  • 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/wix?keyword=na+symbol+element
    • https://static.s123-cdn-static.com/uploads/4368955/normal_6008d4e7b19e7.pdf
    • https://cdn.sqhk.co/kululojilo/pohagdm/farming_simulator_16_mod_apk_android_oyun_club.pdf
    • https://cdn.sqhk.co/tokarikadez/zje5Wic/japanese_alphabet_in_english_letters.pdf
    • https://cdn.sqhk.co/molavagew/Tjdiijj/5_seconds_of_summer_teeth_lyrics_espanol.pdf
    • https://buvekidi.weebly.com/uploads/1/3/0/7/130775196/zigusule_tedibotimerax.pdf
    • https://getukesi.weebly.com/uploads/1/3/4/7/134735407/c5f2721c20c7c.pdf
    • https://cdn-cms.f-static.net/uploads/4480382/normal_603113a17fb09.pdf
    • https://cdn.sqhk.co/rizikodeni/Yhjigif/gulabi_aankhen_song_old.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://77ac2d45-d533-4b4b-a85c-01e81860bff9.filesusr.com/ugd/7f1ad7_e5fee4a2115b4c0d8d42af4942145468.pdf?index=true
    • https://ddb0fe67-a09a-413d-b59a-c21b1dde3186.filesusr.com/ugd/3f0e57_767bb168be0d45bfa7284b5ef21684c2.pdf?index=true
    • http://sulenovigadi.myartsonline.com/fisco_agenda_2020_descargar_gratis.pdf
    • https://3176e400-c268-4dc0-8d69-08eae86937f8.filesusr.com/ugd/ea2f88_9d937a8681604d7396fe57863dac913b.pdf?index=true
    • https://9db8f275-5044-409a-aa1b-3306d9dda9bd.filesusr.com/ugd/361f4b_969ccbb4dad84df9ab432b50ba11c2de.pdf?index=true
    • http://pevipitoz.atwebpages.com/lukir.pdf
    • https://6c036dbd-b327-4678-b778-de8a2ee7bb50.filesusr.com/ugd/ed64d2_d4bae6f18de043b28ed09fc3f3eac620.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/
    • https://savannah.gnu.org/projects/freefont/
    • http://www.gnu.org/licenses/
    • http://www.gnu.org/copyleft/gpl.html
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 6

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001523a.bin
9417c7b9b27351e302d84f78a916580b5dd3f5995b5d8dc282c5b1de6db13999		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1523A 6856 bytes
font_01_sfnt_off0001635c.bin
5e2d57d6dd2c31ac55912229b606b6b317f64ce058074f3554228da3b5c5a3bb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1635C 5464 bytes
font_02_sfnt_off00017176.bin
743ee45277ad05c75c0a08bf852b3767bf6f246f3a4c0218af173b3d6b7aefe7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17176 4948 bytes
font_03_sfnt_off0001823f.bin
5944e2b923da46f93dca52e93096f5102dba4b2a0985dc13c1d35493dac728b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1823F 2608 bytes
font_04_sfnt_off00018d63.bin
7a372978b265a28892160bf9fd885a939a1a6ae4a4d65decfc73fb2c034b2626		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D63 14340 bytes
font_05_sfnt_off0001bae1.bin
ea740c84e3e922f246e1da184378f4ae8516e3a77b876f443f55de8ea0339e58		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1BAE1 18744 bytes

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