PDF malware analysis — malicious · 2cc23013953a568d

MALICIOUS

PDF

82.5 KB Created: 2021-03-24 11:36:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13

MD5: 1b5a6a80fc66e53c9274db305d1d081d SHA-1: 0ec92988992aea2cdec2ab55c7502d1740d889a6 SHA-256: 2cc23013953a568d7f82652c9f68bb86d746f513a7e2efc08a931e688ec5d1cb

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 pointing to disposable hosting, suggesting a link farm or SEO abuse tactic. One prominent URL, 'https://seumenha.ru/123?utm_term=present+simple+vs+present+continuous+worksheet+islcollective', is presented in the document body, disguised as educational content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

Nyx PDF Classifier malicious score 0.9995

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://seumenha.ru/123?utm_term=present+simple+vs+present+continuous+worksheet+islcollective PDF link annotation
- https://cdn-cms.f-static.net/uploads/4465259/normal_60391c4827873.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4460954/normal_60462ae146f11.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4375093/normal_6058c18e86713.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4410694/normal_6025e5d380849.pdfIn PDF document text
- https://static.s123-cdn-static.com/uploads/4459482/normal_5fcba3fa7ad33.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4485693/normal_60396e5aad29f.pdfIn PDF document text
- https://nogiwesetegi.weebly.com/uploads/1/3/1/6/131637024/vumolufufasiloxosi.pdfIn PDF document text
- https://taxonegumogel.weebly.com/uploads/1/3/5/3/135330056/8085578.pdfIn PDF document text
- https://cdn-cms.f-static.net/uploads/4485927/normal_601edcd0b7c9a.pdfIn PDF document text
- https://lezanixopedem.weebly.com/uploads/1/3/4/8/134886347/merimirujofebap_jipixilitu.pdfIn PDF document text
- https://vadukoku.weebly.com/uploads/1/3/4/7/134707593/4861196.pdfIn PDF document text
- http://www.ascendercorp.com/In PDF document text
- http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
- http://www.daltonmaag.com/In PDF document text
- https://s3.amazonaws.com/mejobu/arvind_trivedi_songs.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/7954f022-1819-4a99-93c2-2e6fd0edc18b/network_specialist_interview_questions_and_answers.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/59606ad5-70b3-4b1d-ac79-ecb83cfb5121/22531018794.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/0fa00943-0be4-437d-beca-0c1ddf6a7e5f/bipowegafepadekokiwumu.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/e9be489b-c533-4766-acfc-49ad10768b71/naming_molecular_compounds_worksheet_with_answers.pdfIn PDF document text
- https://s3.amazonaws.com/nitizobuv/ejercicios_para_aprender_verbos_regulares_en_ingles.pdfIn PDF document text
- https://s3.amazonaws.com/tokafanawa/bcom_ca_full_form.pdfIn PDF document text
- https://s3.amazonaws.com/vuxirefare/gba_emulator_android_pro_apk.pdfIn PDF document text
- https://uploads.strikinglycdn.com/files/db37b0c4-0361-401a-bdb8-2bce069c24f4/art_models_book_free_download.pdfIn PDF document text
- https://s3.amazonaws.com/tejuvonixag/genetics_codominance_and_incomplete_dominance_worksheet.pdfIn PDF document text
- https://s3.amazonaws.com/diwitapezu/graphing_quadratics_in_intercept_form_worksheet_kuta.pdfIn 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

Extracted artifacts 3

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`font_00_sfnt_off0000ec6b.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xEC6B	5060 bytes
SHA-256: `d81e23c490a2de98164334fa9f3e1870e6971826d87a962f47a14fdb366d5e61`
`font_01_sfnt_off0000fd81.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0xFD81	15380 bytes
SHA-256: `a1ad334757b0bce704035a68a89d98742c726a0159b428ec9c8a1291a2fb8eaa`
`font_02_sfnt_off00012d41.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x12D41	4324 bytes
SHA-256: `05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176`

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