Malicious PDF — malware analysis report

Static analysis result for SHA-256 7b7efbdd12df6778…

MALICIOUS

PDF

84.2 KB Created: 2021-03-30 06:31:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 358eb497d479130a0b4052b892336a0d SHA-1: 68b638ba18d8bca489cb6b78afa1159fa0bec64a SHA-256: 7b7efbdd12df67789660beeb47b8dfa972749b5422202c6b6269c27378d989ca
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URIs, 'https://xajibur.ru/award?keyword=anemia+sel+sabit+adalah+pdf', is particularly suspicious and likely leads to a phishing or malware distribution site. The document body is heavily obfuscated and contains metadata suggesting it was generated by wkhtmltopdf, which can be abused to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://xajibur.ru/award?keyword=anemia+sel+sabit+adalah+pdf PDF link annotation
    • http://copyrightsupporthelpcenter.com/jutatifabobesibidoxpm4w4.pdfIn PDF document text
    • https://cdn.sqhk.co/wabasenenem/ijYOjjL/jidudemuvap.pdfIn PDF document text
    • http://habirovradik.ru/50330830537i6sla.pdfIn PDF document text
    • https://cdn.sqhk.co/nukuzulu/jbvigjj/comprar_favo_de_mel_em_curitiba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_638a89112c29486593a8418273315c6f.pdf?index=trueIn PDF document text
    • https://9cfe8934-cc69-4f76-a0d0-2e9849ea4530.filesusr.com/ugd/fd9558_c41e1346e5d44de68bfa1430afbfdb79.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a06d1f15-af83-4a50-bac4-a98db2615ecb/laxipewopubo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ccdb614-e2fa-4109-ba88-a983fb89d4f3/fichero_de_actividades_didacticas_espaol_primer_grado.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cb9c647-76b1-40b9-afee-80d26a3060d2/13485648495.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/18aaa299-b184-4cbd-ba45-8d6ee4909226/11719970872.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe4d41c4-7685-4fed-b2c5-5922308e46d8/five_different_types_of_clothes_material_in_india.pdfIn PDF document text
    • https://45f61934-b4a1-4335-a9e3-e142d9465b5b.filesusr.com/ugd/0dd040_5a3a91f0408e4f17b358c32136709437.pdf?index=trueIn PDF document text
    • https://44eeb0f0-4dc9-4d8b-b3fd-cc7ace98e90e.filesusr.com/ugd/a083a1_08684759b1d84ce99bdcbe05bb72e14a.pdf?index=trueIn PDF document text
    • https://438c9214-13ba-44a2-8469-a4c97ff43377.filesusr.com/ugd/5d46a0_1342daf9f05348f6baa6cf36e0937621.pdf?index=trueIn PDF document text
    • https://0c2a7d7b-be9d-4ef2-a94c-09ca905cc17d.filesusr.com/ugd/7d21c0_3d8d98224a8e4e5caa1d66ae3e3c6710.pdf?index=trueIn PDF document text
    • https://6bc553e5-d0de-4278-827a-c77c8eb32fbd.filesusr.com/ugd/4a6c57_1ab4c4f7a12d43d9a96eadb8167d2c24.pdf?index=trueIn PDF document text
    • https://b3695a61-a5b7-457a-863f-99677d03e0cc.filesusr.com/ugd/f2a82d_8822b033fc414a36b58653894bd359f0.pdf?index=trueIn PDF document text
    • https://ac614e2c-2e00-43e4-a80f-2c6bce9fb64b.filesusr.com/ugd/f103bb_bbee7e9ba56f425bb8d8a4ad4da1182a.pdf?index=trueIn PDF document text
    • https://a8fdb364-3865-4521-a36b-e12f4de7752f.filesusr.com/ugd/e20637_e98ddf46053d4a1195b72fafef2a09ff.pdf?index=trueIn PDF document text
    • https://4541bc1c-e35c-4de3-bb44-1f53c3e1a56d.filesusr.com/ugd/68f66e_722fe61494a4438fb98b04de912fc607.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010c29.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C29 5312 bytes
SHA-256: 9fcb930fcaea01e37b9f9df8fd1de4cdd47cc741afa44a0eedfe843c629e816f
font_01_sfnt_off00011e05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E05 11052 bytes
SHA-256: 67d9e36f53f9c0f6f2c063d6c55f1d4c5fdc53bf6a303be75f8206e9ad9126d2

Open this report in the interactive analyzer, or submit your own file for analysis.