Malicious PDF — malware analysis report

Static analysis result for SHA-256 e6c1bd5681db4825…

MALICIOUS

PDF

72.8 KB Created: 2021-06-02 21:30:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e40340ec39c4ceeb8e2a14c924494a76 SHA-1: cf6f99273c44dc0b19729ce0dc356a64100531d7 SHA-256: e6c1bd5681db4825e7fc3c8d4343a29b5636a64e3e89da80d472b945b198763c
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document, likely delivered as a spearphishing attachment, designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://inwebjor.ru/pbw?utm_term=how+to+write+a+sales+agreement+for+real+estate PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473640/normal_6019681b912b8.pdfIn PDF document text
    • https://tejubodefi.weebly.com/uploads/1/3/4/3/134351051/839b0fbcbafe2.pdfIn PDF document text
    • https://mixifotosipepe.weebly.com/uploads/1/3/4/8/134875306/e9c5b.pdfIn PDF document text
    • https://mevusaku.weebly.com/uploads/1/3/4/7/134721943/waxezexuxoduti.pdfIn PDF document text
    • https://turazuxutanuv.weebly.com/uploads/1/3/1/6/131606798/jesegixunumuga.pdfIn PDF document text
    • https://fogujudusimasob.weebly.com/uploads/1/3/4/7/134713994/pawojidabagade-noparixosevever-patibebawuv-juxufogiruniba.pdfIn PDF document text
    • https://dusonomikeka.weebly.com/uploads/1/3/2/6/132695238/4150668.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392191/normal_60221afe477e8.pdfIn PDF document text
    • https://nobenala.weebly.com/uploads/1/3/4/3/134348336/05d80.pdfIn PDF document text
    • https://jefevitekigo.weebly.com/uploads/1/3/4/5/134586767/tajudivigenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tujelupirobe.pbworks.com/f/40205057155.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dee34a51-a136-4e81-a44e-9a2cbc43e7e3/are_in_a_sentence_for_kindergarten.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce207701-0ec8-46ca-8271-0c385df501e1/lights_out_2019_david_spade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e14b3488-915e-45b2-a32e-7abef6f1b34c/nujejajiga.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/08dd3caa-2b5f-464d-aa92-95edb5d260d2/how_to_clean_t_fal_mini_deep_fryer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c95af28c-9cec-4748-b357-535c96a0771c/samsung_un55js7000f_stand.pdfIn PDF document text
    • http://pebokuvog.pbworks.com/f/80895216914.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6650d0dc-839c-4168-ba1b-1f46e5035ae1/65390500380.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d1e13ee-00db-44c7-ab5a-77aaa7325291/cuantos_son_16_pulgadas_en_cms.pdfIn PDF document text
    • http://pefagisunel.pbworks.com/f/economic_geography_of_india_and_world.pdfIn PDF document text
    • http://ziludezubeju.pbworks.com/w/file/fetch/144457923/23508920399.pdfIn PDF document text
    • http://vananizi.pbworks.com/f/194846906.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac45669f-c5b2-406e-9ff3-d0ada8934337/sadilikozokijavoruluv.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c45c9384-4f28-4af9-a6e3-0f10eb04793b/how_to_start_doing_interval_training.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ddab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAB 5140 bytes
SHA-256: 60104b95da55f5117bf8c77af1de95a1dd61098c70a7535734ee315ae5f5d73e
font_01_sfnt_off0000ef24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF24 10740 bytes
SHA-256: be48b4acfcaf664066a4ee0c128ad31bbcede53abf230997c184123d01c12210

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