Malicious PDF — malware analysis report

Static analysis result for SHA-256 be833676251465e6…

MALICIOUS

PDF

74.5 KB Created: 2021-03-14 17:42:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6fdfd4e021d7353a311de68cc486620b SHA-1: 950fddf496704d8aee8f8713edac930d47fac943 SHA-256: be833676251465e69f621e60df49e9cd753326abf478fe5620ec6b87634cdc5d
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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://xezojetit.ru/strik?utm_term=how+to+make+printable+vinyl+stickers PDF link annotation
    • https://tutusilubejisev.weebly.com/uploads/1/3/4/5/134599447/loxadajogan.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369796/normal_5fdc2ec5350a2.pdfIn PDF document text
    • https://zakesulukagog.weebly.com/uploads/1/3/4/4/134493448/ac25bdfb2bd4.pdfIn PDF document text
    • https://cdn.sqhk.co/rapekerokemo/29qfsjg/wexaga.pdfIn PDF document text
    • https://xaxuxogupovugid.weebly.com/uploads/1/3/0/8/130874119/6083020.pdfIn PDF document text
    • https://cdn.sqhk.co/vakanaju/7gehihj/dudexanapiwutivolojipiron.pdfIn PDF document text
    • https://xesuxikoju.weebly.com/uploads/1/3/4/0/134095833/sakowataf.pdfIn PDF document text
    • https://cdn.sqhk.co/nivavepe/aQigBAH/nintendo_switch_pro_controller_connect_to_pc.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481271/normal_5ff94c470b74e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382976/normal_5fd163e969e5c.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/jonora/rural_development_mcq_questions_and_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eec8b20d-8d84-4bca-911d-1307547e823c/2019_drz400sm_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1b0b18d1-d905-405f-8c58-4975e9134302/does_microsoft_office_have_a_family_tree_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bca6a622-11ef-49d7-b6f3-7e77f4ce8b96/jinunomiwibojuxa.pdfIn PDF document text
    • https://95a57b4d-a24c-4412-bd87-88f4f885d252.filesusr.com/ugd/011e4b_eb0a64832d9d42038001a01fb25b1f5b.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_8c64e5ec0b414b5c9b3a92f0b7cef3df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nitizobuv/2531232976.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_off0000e312.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE312 5500 bytes
SHA-256: 2189efa891355ebe0b9b6c688a8ac32ed5a471c82514293dc6e064453297a4f2
font_01_sfnt_off0000f5c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5C4 11520 bytes
SHA-256: a7f1162c8d6373ccbffc176f94eb7dcd73c6d81210b84a1e4e03e0df386405fc

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