Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4143871d0a476a…

MALICIOUS

PDF

67.9 KB Created: 2021-05-27 14:41:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a3e11ab499fadcaf289831d465836287 SHA-1: db5c18e05b7dcf5af22f84db72268a73bfc98d88 SHA-256: 9c4143871d0a476a49b2bcd92551641fecd6306e7e98226c9726d27590ddce20
214 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ClamAV and a machine learning classifier. It contains a large number of embedded URLs, with at least one pointing to known malicious redirector infrastructure. The document body appears to be corrupted or heavily obfuscated, preventing a clear understanding of its specific lure, but the overall structure suggests a phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://yafferge.ru/strik?utm_term=guide+de+survie+du+chef+de+projet+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4447903/normal_6061cc2000f1c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422622/normal_5ff531ed07b62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369665/normal_5fdf3a8031b9e.pdfIn PDF document text
    • https://gurelupukuji.weebly.com/uploads/1/3/0/7/130775622/pubezux-xorarujizij-xolanina-fenotepe.pdfIn PDF document text
    • https://tuxativavowaz.weebly.com/uploads/1/3/1/4/131437956/webupobebonamovam.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_6001bedeaa881.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470402/normal_6022d7c292970.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459936/normal_5fe4505fe85fc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426271/normal_606b495399ecb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471275/normal_60249cf2dc5a2.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/38d65f91-5072-4da8-ae14-50e6c71213b2/lejidijetox.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f00b980-f0f7-414e-9d00-0996c4b09733/93222035639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f0f48c2-2763-4dda-99ab-26aa59f01954/pepapinojapav.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc5a3038-80bf-40df-af65-82d9a9bac43a/85587085062.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f91cc8e7-eeb3-4bd7-9dbb-d8c920854672/toxowatezafi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb7ecbee-4440-49c2-abf2-9abb54b6a669/troy_bilt_tiller_repair_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/97ca151e-37bd-44eb-9c38-d1280762d32e/43292748999.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bff0de6-9d02-4f8e-bbd2-9a0b73ca2789/coast_guard_physical_fitness_test_trinidad.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/287da798-6ec9-44db-93d9-9b0d61c4cfb0/new_2020_golf_buddy_aim_w10_smart_watch_golf_gps_touch_screen_40_000_courses.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_off0000cc86.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC86 5168 bytes
SHA-256: 5d3a3e99f525491624564d14921104993fb6a0dd663571d2a5875f7345ebf98b
font_01_sfnt_off0000de30.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE30 10632 bytes
SHA-256: 24c3f4d84bf6f75cbd43ad1ce75b0fdf70db2189cb47a3403b02bdec65704ca4

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