Malicious PDF — malware analysis report

Static analysis result for SHA-256 912f9d11132309f2…

MALICIOUS

PDF

108.3 KB Created: 2021-03-27 15:47:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 878ea6f8a4763cc592bdc70fab8413c8 SHA-1: 2bac3ffb63aa96edb652e701e348ddec725941c8 SHA-256: 912f9d11132309f21e561913a75a28a1d3becda6723cbf9b3c3c848bee252c4c
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, with a significant number pointing to a link farm designed for SEO. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of generated links, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful sites. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://jacksth.ru/wix?keyword=poetry+about+soldiers+in+urdu
    • https://watorixaziju.weebly.com/uploads/1/3/4/5/134586039/84e42d.pdf
    • https://tekudijasefemo.weebly.com/uploads/1/3/2/7/132740256/rosob_sirimutugebij_masevozixunof_pokuvavamabi.pdf
    • https://cdn-cms.f-static.net/uploads/4407057/normal_603dee6c58e20.pdf
    • https://cdn-cms.f-static.net/uploads/4471256/normal_603267f7046b1.pdf
    • https://static.s123-cdn-static.com/uploads/4418746/normal_600012df889e8.pdf
    • https://cdn-cms.f-static.net/uploads/4453720/normal_5fd79abf637d1.pdf
    • https://rizegenaw.weebly.com/uploads/1/3/4/1/134108854/9168892.pdf
    • https://visofebofoxofub.weebly.com/uploads/1/3/0/8/130814652/574d19c38.pdf
    • https://cdn-cms.f-static.net/uploads/4369498/normal_603ba026de7c4.pdf
    • https://cdn-cms.f-static.net/uploads/4416500/normal_602da9eda1a2b.pdf
    • https://static.s123-cdn-static.com/uploads/4490371/normal_5ffb7d6414aec.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://fedorahosted.org/lohit
    • https://uploads.strikinglycdn.com/files/511227f5-753b-47aa-b02a-de91ce2c24b0/puzel.pdf
    • https://uploads.strikinglycdn.com/files/39f2fcd7-f35c-434c-b613-9d1c5f6e588e/konakenewedavojifibusotad.pdf
    • https://uploads.strikinglycdn.com/files/c97aab30-ba46-473d-b16a-3f118973fed5/tojelugosiluxogelunurami.pdf
    • https://s3.amazonaws.com/kesumasaka/97944131154.pdf
    • https://s3.amazonaws.com/masevewi/generales_de_dios_1_descargar_gratis.pdf
    • https://uploads.strikinglycdn.com/files/1d7d9fee-5a80-42e7-8824-35372beeb53d/93192253172.pdf
    • https://uploads.strikinglycdn.com/files/17fbf744-bc65-48b4-a2b8-02ab0375dae9/coming_to_our_senses_neil_degrasse_tyson.pdf
    • https://s3.amazonaws.com/mokuwanibof/51280360211.pdf
    • https://s3.amazonaws.com/voropa/donokenasobulorufuko.pdf
    • https://s3.amazonaws.com/fapaga/is_gap_worth_it.pdf
    • https://uploads.strikinglycdn.com/files/511269ec-993c-459e-a0f4-450c98030ed3/sifofujusafurezefox.pdf
    • 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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNU
    • http://www.gnu.org/copyleft/gpl.htmRegular

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_006_off00015457.bin
4eb46a208808dfe2fae33198f26e11442baeb1c5eea60f9226e3c59275ee4a40		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x15457 26212 bytes
font_00_sfnt_off000113e9.bin
65f9de71a8401d88db103367b62acd812cb97e8423ac3aff8b5f2f1769f19cac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113E9 5060 bytes
font_01_sfnt_off00012527.bin
a7c194c348f4bc26aad06ae1fa1eadf76503a3aca856ff80314c3d87a816eea9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12527 3720 bytes
font_02_sfnt_off00013087.bin
ce6ef35b35fb3b574ebc615d2444a8ce4c164ded20578bd5dad4338dbbed5cc9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13087 10616 bytes
font_04_sfnt_off000181c4.bin
e409164baa7a3e21d4e652e5d5e3f7edc9c615047e7d392c0a05cd02017c4c3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x181C4 10044 bytes

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