Malicious PDF — malware analysis report

Static analysis result for SHA-256 9287c0ae2a39d41a…

MALICIOUS

PDF

92.9 KB Created: 2021-04-07 05:08:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: a9ebd7b1be23c9d607461d0d0e02e650 SHA-1: 212d36bfcb268d961d004e813572d83059e5d85a SHA-256: 9287c0ae2a39d41a728064c59b83219fc6503cd9b9f23604c391fd6b600f1267
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of external links, identified as a link farm. The primary external URL, https://xajibur.ru/award?keyword=etiology+of+lung+cancer+pdf, suggests a potential SEO manipulation or phishing lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution through the linked content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9967

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://xajibur.ru/award?keyword=etiology+of+lung+cancer+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4450438/normal_5fe84dd3614a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473919/normal_606197b265808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465949/normal_606d0d5ebaf6d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387819/normal_606534fc0ad7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426941/normal_5fce2e8ab8f84.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489595/normal_6016e38eb32d0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451350/normal_60473a146430b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449187/normal_603bdc8f9a41f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391314/normal_603302d9cae6e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4459624/normal_5fe59d618d362.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zafijukopa/united_colors_of_benetton_meaning.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed28f549-d5dc-4db4-ad11-e8f5237d07ce/jakipiperilidetolevuzigew.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/30046820-3e07-4203-9148-347a9de0129f/fasevora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/92c7bd6e-be49-458c-b5bc-66ca415d7e16/vozamipe.pdfIn PDF document text
    • https://s3.amazonaws.com/kokesatodixon/solisupupatak.pdfIn PDF document text
    • https://s3.amazonaws.com/vavale/the_vampire_diaries_svg.pdfIn PDF document text
    • https://s3.amazonaws.com/fuzafuzeruwit/baal_veer_1111_full_hd_video.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d7f328a-7890-4aa7-b5f7-ffd8efeed1d1/peter_and_wendy_book_amazon.pdfIn PDF document text
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_c1b9056a2dc9486d96f89f4ecef745e8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6507986-dd89-42c1-8f94-a19c85a72615/31700591070.pdfIn PDF document text
    • https://46d16763-6c5f-4e19-aa2c-3f4071fcbec2.filesusr.com/ugd/26f730_199d60f45e8147d3a48113a0f99bc618.pdf?index=trueIn PDF document text
    • https://4bf641bf-117a-4913-931f-55e49063997f.filesusr.com/ugd/5befcb_38acb7723ee84443b39fe58b9d33beec.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/furunumaroxun/el_general_naranjo_temporada_2_capitulo_9.pdfIn PDF document text
    • https://58552d80-c20c-4e4f-99b9-91bedbcc07a3.filesusr.com/ugd/c18496_17970eb1f7294741b21c8e2ae069255e.pdf?index=trueIn PDF document text
    • https://0c17d2ad-06a2-4efd-9128-26148cac6670.filesusr.com/ugd/44320b_99cca0d4979f4993a7f8d1869688f4ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bupijila/honeywell_humidifier_cool_mist_manual.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_off0001293e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1293E 5204 bytes
SHA-256: 50e3ae89dd3cb2d31fc71206972f8a35aa372b1c45110e79169e71b3afe78ca7
font_01_sfnt_off00013b19.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B19 12596 bytes
SHA-256: 95bdff45c7fe395a7396235440970e88a72fd6205c0a166832bca12aeab48a8b

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