Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ad506f531204976…

MALICIOUS

PDF

82.0 KB Created: 2021-05-28 12:22:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 4e0edcdfada743a47b06cdd0bdc6f7b1 SHA-1: 5377912bd617a5beb57c4d804e1f59d0d068df8f SHA-256: 0ad506f531204976ff6e95dcc46719608ec0d255cbd9346b84cbfeddd5c71572
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm or phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a spearphishing attachment used to redirect users to potentially malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/123?utm_term=qualitative+data+analysis+with+nvivo+pdf PDF link annotation
    • https://nojesinas.weebly.com/uploads/1/3/0/9/130969722/9b8d10eea257cd6.pdfIn PDF document text
    • https://jovawovifo.weebly.com/uploads/1/3/4/8/134883275/gewubewikum_newijiwek_nazajefu_zasugijoj.pdfIn PDF document text
    • https://niritamin.weebly.com/uploads/1/3/4/4/134486676/vemuz_begane.pdfIn PDF document text
    • https://medefali.weebly.com/uploads/1/3/4/0/134012737/forizofokuravosiz.pdfIn PDF document text
    • https://fogowedosetoz.weebly.com/uploads/1/3/4/7/134703805/82e8f3c8.pdfIn PDF document text
    • https://tidovikazixuwuj.weebly.com/uploads/1/3/4/3/134316919/d85220473a91.pdfIn PDF document text
    • https://mupibidegupek.weebly.com/uploads/1/3/0/8/130874042/f48af7c303.pdfIn PDF document text
    • https://kesegupopu.weebly.com/uploads/1/3/4/1/134131766/movof-vizaridufodudav.pdfIn PDF document text
    • https://nugekowu.weebly.com/uploads/1/3/4/5/134587082/f7698.pdfIn PDF document text
    • https://duguzimelape.weebly.com/uploads/1/3/4/6/134666192/9144528.pdfIn PDF document text
    • https://putesoborufo.weebly.com/uploads/1/3/0/8/130814126/bd359.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://uploads.strikinglycdn.com/files/f79bc1c6-b4fe-48fa-af94-81faf317e851/batalakovukim.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/febb08ee-2486-463b-aef9-c595228df8a7/55277443971.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c0ffa7d-466c-43dc-8d64-05e4e8dba355/24384984113.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e995c9b-7f15-496f-8110-209144b1994c/vadetuzis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34b6d51e-de5d-441c-acda-3f2589edd3e6/fiwilelo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6af8d91-874a-45ec-89d0-2ef190bb0f8a/italo_calvino_le_cosmicomiche.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5d4ea5-d82d-47e4-bd65-05ec00c7de25/the_hitchhikers_guide_to_the_galaxy_2005_film_netflix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/537ed7bc-51e6-4315-b979-4da18c99fd8b/wenavigaze.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/11a8998a-365e-4117-9ab8-e529e0710c40/yaesu_ft-897_service_menu__internal_menu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c5815e29-598c-421c-ade0-2e5094ad7d98/duele_amar_optimovision_capitulos_completos.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8174482e-1c64-464b-ad65-1b99f2e9e85b/tabla_periodica_ingles_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61eb7e21-a35b-4f9c-8bf0-ccd4fc92acae/57079303650.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/86c3c284-9d82-4a58-ac38-c8e2ae2a507a/what_is_the_40_days_after_death.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.

FilenameKindSourceSize
font_00_sfnt_off0000f36f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF36F 5228 bytes
SHA-256: 45a5224650d89dbf8396c1dcfc76fc882d2d2b1f62bd50cedc7592a3cc74b1d4
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 11616 bytes
SHA-256: ab5b7aeb0b8ca51be2cba6bb4f5ce59afee9dabe322653d65531c79e94a57353
font_02_sfnt_off00012c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12C43 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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