Malicious PDF — malware analysis report

Static analysis result for SHA-256 a720bc78f8eeed75…

MALICIOUS

PDF

86.1 KB Created: 2021-04-06 01:57:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 9958f6c489af4e5831e90a179bd45c02 SHA-1: 2a1f72f9eb3ac2183a79e3256bbebc88905df823 SHA-256: a720bc78f8eeed75ab0d7afba9a19706d9e53769f3af20864f9b7c77de77fe68
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, suggesting an SEO spam or phishing campaign. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://druttle.ru/award?keyword=bpsc+non+cadre+syllabus+pdf PDF link annotation
    • http://zagavexakagin.mypressonline.com/aprender_ruso_basico.pdfIn PDF document text
    • http://rajajime.mypressonline.com/36054815404.pdfIn PDF document text
    • https://tebuwopelovenep.weebly.com/uploads/1/3/1/4/131453198/c0b695f.pdfIn PDF document text
    • http://kojazunupetip.mygamesonline.org/alley_cropping_system.pdfIn PDF document text
    • https://zafapuguma.weebly.com/uploads/1/3/2/7/132712217/3590722.pdfIn PDF document text
    • https://fuzimisadu.weebly.com/uploads/1/3/5/3/135319831/7151293.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://75e6061f-eb7a-4ce8-b546-077bf96366c3.filesusr.com/ugd/2dfd19_7f3c3b5f779e48ff93d19faf9a54bda9.pdf?index=trueIn PDF document text
    • https://69b3109a-7cce-4514-9193-d2106d9976ab.filesusr.com/ugd/3c2969_4904ce6d685549dc987d73651ed147be.pdf?index=trueIn PDF document text
    • http://mepitar.atwebpages.com/operaciones_bursatiles.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_780be09120cf448c8c8c0af70f23686e.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a859a643-3000-4964-9f8f-e683bb04da4b/cultivo_de_pia_golden_en_costa_rica.pdfIn PDF document text
    • http://bejutamukedus.epizy.com/assistir_globo_reporter_ao_vivo_pela_internet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76306c1a-71cc-4069-9150-4a9d65666516/simple_rest_web_service_example_in_java_using_eclipse_and_tomcat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/014ee609-58c5-4a2e-b3d7-7eea8d5f1a06/22998712780.pdfIn PDF document text
    • https://3eeb541e-75be-486c-a732-b1e279b2a932.filesusr.com/ugd/eaab1c_bfbbaa2e3d7148b6a919cbba2f10f8ff.pdf?index=trueIn PDF document text
    • https://98be45bc-63b9-4117-aff7-84a3d4f2c4a0.filesusr.com/ugd/90c678_d20b61e0e2ca4493948eb60396c7ebc8.pdf?index=trueIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_9227052332674e2e99eea527cc99f9d7.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/8a60ede9-e6c1-459e-a062-59e29e9888fb/58843144273.pdfIn PDF document text
    • https://46fb9a51-9e16-4ad8-811e-2f7ed01702f7.filesusr.com/ugd/53363c_ee87dba443a9496e984e9335b98053d4.pdf?index=trueIn PDF document text
    • http://pakilapawunafep.epizy.com/adobe_photoshop_lightroom_cc_apk_for_pc.pdfIn PDF document text
    • https://bf23b77b-49a9-4bef-a898-a03cfb94aefa.filesusr.com/ugd/134172_87256761cd4f4b0aa6794ac4c347c94c.pdf?index=trueIn 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
    • http://www.geocities.com/mitra_anirban/hobbies.htmGNUIn PDF document text
    • http://www.gnu.org/copyleft/gpl.htmRegularIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e1b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1B5 5440 bytes
SHA-256: d70c5542f0da7647dcbb18bca55d1ef4cba18fc6543471b53a54e7980ef1ec2a
font_01_sfnt_off0000f444.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF444 16220 bytes
SHA-256: 4bf9851874dfcc155ae31763c3c12e0f6eaddcba8d8b63954a256fd4c9fb7a1c
font_02_sfnt_off000124ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124BA 11056 bytes
SHA-256: d2af85ecbf1c719da305b59c3476d4b02f962130f256ac7fcae56bacf80afe36

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