Malicious PDF — malware analysis report

Static analysis result for SHA-256 c245bef460cdec4e…

MALICIOUS

PDF

88.9 KB Created: 2021-03-17 14:33:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 0e16ff6ca3c35fa2d32210182e911cc7 SHA-1: ab845e67e36f7c0833422c8ea78ce9d897d9d222 SHA-256: c245bef460cdec4e8358301cb67fb4c6fdd325145992972cd59b4a08e0a14782
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, identified as a link farm, with a primary URL pointing to 'kuzutuzo.ru'. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing trojan. The document body, though heavily obfuscated, suggests a lure related to 'iti electrician tools list pdf', indicating a potential phishing or SEO spam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://kuzutuzo.ru/award?keyword=iti+electrician+tools+list+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495841/normal_5fed1bffe1bed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501364/normal_6009d8be573f2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422147/normal_5fec64fb8c84e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379733/normal_601c7b60c7355.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479917/normal_601dc0507afb2.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/062de550-b262-4786-b824-35e5e52ed623/big_little_lies_writer_daily_themed_crossword.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0178dcaf-eb49-4e7a-b921-f3e33b6a4338/visoxafarofaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/355a2864-8b9c-4454-8233-1f46df4c9e19/razer_ouroboros_wireless_setup.pdfIn PDF document text
    • https://47e4df30-8702-49a4-8bd5-327e1546ff06.filesusr.com/ugd/379272_9561391902224eea93ef9d2dabff0d93.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bf97836-7faa-4105-aac6-9912edf66a56/12500153120.pdfIn PDF document text
    • https://5366dd3f-28a3-4342-b8e5-5bed86455aec.filesusr.com/ugd/a92322_c936b33bc8e94d2a8b2050e83c668128.pdf?index=trueIn PDF document text
    • https://8d6920c1-aef5-45ed-b1a0-e693d63948fb.filesusr.com/ugd/0a593f_453f213423bd42299adafc2c1452589d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e54b7b9-66cf-4e7d-84b8-f8b5e34a0fd3/convert_ipython_notebook_to_python_file_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7386a5a2-edb0-45c7-8673-fbf73ad3cc27/wokevenubef.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b19ea62-8807-4e9e-92f9-687df104a69d/xewutamegimavasoka.pdfIn PDF document text
    • https://4b0cdf75-2e42-4830-99f1-bbdbaec3f661.filesusr.com/ugd/891219_feb5230fb3ea445cbbea1159e3751cd4.pdf?index=trueIn PDF document text
    • https://3a0d5408-2ea1-4258-8d29-5d96341cad2c.filesusr.com/ugd/79cb75_5389f976518142d4bd98104585977029.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcc6505-13eb-402e-bee0-de0f5e415b32/23947033926.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a279313-e027-4edf-bc75-ac42cc7beb7b/literary_devices_definitions_and_examples_of_literary_terms.pdfIn PDF document text
    • https://3dd85f33-233b-4b3c-8e53-142bc8307eec.filesusr.com/ugd/8df890_843cded99bcd4aea874ea2cd15246d86.pdf?index=trueIn PDF document text
    • https://ac402fee-74f4-49a6-b5a4-6a03c6a057de.filesusr.com/ugd/b0cd75_f06edb1a512e432fb3de35f29e8e00e3.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_02b3ee526c134ce883d5dc635e4eff18.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/110d43b9-c152-4fe3-b610-998b0c2b50d2/langstroth_beehive_dimensions_metric.pdfIn PDF document text
    • https://ba3a7bb5-edd2-4228-b29c-cf272df6a868.filesusr.com/ugd/bd1c09_a992ba72d440443086a0b7c966b03b44.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_off00011e80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E80 5088 bytes
SHA-256: 3e8f9eb123b07f8b161c749c55b15272adab8b07d2f97a522182507400a6164d
font_01_sfnt_off00012fda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FDA 11328 bytes
SHA-256: 6eeeb76428830a14d0c5eee5f26b80ed2453988bb3ac12bd0d7d9e0551ef858b