Malicious PDF — malware analysis report

Static analysis result for SHA-256 65699a4c6f89d754…

MALICIOUS

PDF

70.9 KB Created: 2021-06-04 20:12:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 5f538b2e898042f96d210548ca475592 SHA-1: 670b83fb02a7a9fe215126a335a1344a35a19e3e SHA-256: 65699a4c6f89d7541461e365a7c9e4d3f4edf481a11b0a802968e3b31169fa1f
96 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The file is a PDF document that contains an embedded URI pointing to a suspicious domain, identified by ClamAV as Pdf.Phishing.Trojan. The ML classifier also flagged this PDF with high confidence. The document body, though heavily obfuscated, suggests a lure related to 'skf thrust bearing catalogue pdf', indicating a potential phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gimoguvi.ru/123?utm_term=skf+thrust+bearing+catalogue+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4459625/normal_604b1fcfb8f6c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480187/normal_606961b775154.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_603428418f13c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408482/normal_6022d0ebcfb0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371020/normal_603a84825b8cd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4469863/normal_602069b857249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454971/normal_6064ed85e5c16.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370056/normal_60b9561b2279c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374536/normal_600e11287ceec.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387704/normal_601a583dddf10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371025/normal_604d48d67d9cb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446930/normal_5fdbe2fd50c3b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/550cfb89-e286-4ff7-9a80-22fc6957d40b/how_to_text_on_consumer_cellular_flip_phone.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13844675-1c43-49af-a391-49a5422f4aeb/curso_de_corte_y_confeccion_para_principiantes_gratis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e6c7325-d3f5-42cd-bae8-b347642ae4c4/zedarutedenebibiliwikuzaj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61930aa8-90a9-4f57-9073-b775eee2478a/josajizate.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fb3bfed5-7fd9-4b16-ba52-792cb2878a38/free_discord_members.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28df88b0-ff46-4442-801b-64dd714ddaba/xopidinokobitorugagub.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5713091a-fbc6-4633-8ffa-0fb8c3f1c1b0/95689668062.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_off0000d618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD618 5724 bytes
SHA-256: e2a9fe120082ccda7a05e3fce8f51552d3daef4c9f278d4c620a630a3644048e
font_01_sfnt_off0000e992.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE992 10432 bytes
SHA-256: 4c968bb49a7054cb38b6ea58c1d27a604403a18ee3a19afee509a11ca1e89f98

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