Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a51e32e302976df…

MALICIOUS

PDF

80.8 KB Created: 2021-04-05 10:01:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 7da72cf28761a37871653c97403414a3 SHA-1: 9e2a09435e0076da995ea965d04fe4952185e127 SHA-256: 5a51e32e302976dff86eb553b762d0d8e36c73ef6e5335000c74b3cc63f6e2b7
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 ClamAV and 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 0.9994

Heuristics 5

  • 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 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://dafemum.ru/strik?utm_term=focusrite+scarlett+solo+2nd+gen+driver+free+download PDF link annotation
    • http://24goodstore.site/judijotipozajetipufem8d2g.pdfIn PDF document text
    • http://re-capital.ru/what_is_non_verbal_communication_and_its_importancejd7fe.pdfIn PDF document text
    • https://gakutuzopekok.weebly.com/uploads/1/3/4/6/134605442/3982450.pdfIn PDF document text
    • https://rufibomorogad.weebly.com/uploads/1/3/4/5/134505720/7367716.pdfIn PDF document text
    • https://jadetikoj.weebly.com/uploads/1/3/5/3/135350844/kikowobirelisa.pdfIn PDF document text
    • http://verefdliyvtorogo.xyz/pour_former_un_seul_corps5dfnl.pdfIn PDF document text
    • http://about-central.com/75313527200lulb7.pdfIn PDF document text
    • http://gopidap.scienceontheweb.net/formato_historia_clinica_psicologica_para_nios.pdfIn PDF document text
    • https://tugivopufik.weebly.com/uploads/1/3/4/3/134348802/cbdc4.pdfIn PDF document text
    • http://tejasatobes.medianewsonline.com/lidinagiw.pdfIn PDF document text
    • http://fuxezaboxekave.scienceontheweb.net/8046189526.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/midipes/galveston_hourly_weather_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/326daa09-33aa-4eb1-a0ea-8f04370b3314/75720981493.pdfIn PDF document text
    • https://s3.amazonaws.com/jipowumat/cold_or_hot_rolled_sheet_metal.pdfIn PDF document text
    • https://58960a86-a3f4-42d8-866e-ee2cf32068b1.filesusr.com/ugd/1ad962_36b98af0839242e6ba9c0260bfe3e614.pdf?index=trueIn PDF document text
    • http://juvusowupu.onlinewebshop.net/zuluratiw.pdfIn PDF document text
    • https://5610d23c-e099-485d-ada5-1c5fec8f01b3.filesusr.com/ugd/97e063_b2526e7ab6bc4f979878283198c8a1a5.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e7e7cad3-359f-4e5a-af97-f2443e94c7f3/zufolupaw.pdfIn PDF document text
    • https://6e337ffa-6c75-4e98-916f-0cab85e7e3f5.filesusr.com/ugd/a22560_fe452090ec454f7ca3fb29b2c381aee7.pdf?index=trueIn PDF document text
    • https://e57d8632-f742-4524-ada6-9cdf759d9f13.filesusr.com/ugd/b0cb2d_72d9be7a7bb8483d824c4bb4ae1217ab.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/patotale/96548331001.pdfIn PDF document text
    • https://s3.amazonaws.com/kotodur/cursive_handwriting_worksheets_for_adults_free.pdfIn PDF document text
    • https://2f60c0de-bae8-48d8-8f3f-ce7907f87c52.filesusr.com/ugd/badafb_47fa32e6e22b4e2d9dd78fb1dfe4a01f.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_off0000eede.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEDE 5428 bytes
SHA-256: 23df9c15f25d11c95375ebdb0a81e5e5b28f2e58729fdb61cb0114d75c900fc4
font_01_sfnt_off00010181.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10181 16292 bytes
SHA-256: 6574e4c97afd0e09a50427ea59d354f2dad630c3a63ef0335f9e66e9e740c100

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