Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbcf53f4d3546f5c…

MALICIOUS

PDF

103.9 KB Created: 2021-03-24 01:49:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: cdf47d960fcdae392667be001fa70197 SHA-1: 86f1e70b8b9e4d8a25f211fad0d44ede36d7f09a SHA-256: fbcf53f4d3546f5c94fbf10e0e50055a7859f3db91fbfce2c0b59a3537f79c0a
156 Risk Score

Malware Insights

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

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 0.9997

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 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.
  • 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://crophysi.ru/wix?keyword=simple+and+sinister+revised+pdf PDF link annotation
    • https://pidowiwosuzaji.weebly.com/uploads/1/3/0/9/130969191/temunewa.pdfIn PDF document text
    • https://cdn.sqhk.co/fulaxanew/jfgiIjd/nabozovuwa.pdfIn PDF document text
    • http://profibrend.ru/myles_munroe_net_worth5t454.pdfIn PDF document text
    • http://j3vnci4.xyz/96015069192w5d6w.pdfIn PDF document text
    • https://dakusarifupufa.weebly.com/uploads/1/3/3/9/133997242/5965851.pdfIn PDF document text
    • http://stavki-na-sport.site/samsung_un32n5300afxza_32-inch_1080p_smart_led_tvbje18.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/FFXiggu/sizaner.pdfIn PDF document text
    • https://laludigulasi.weebly.com/uploads/1/3/1/4/131437637/22c71b35dbe5.pdfIn PDF document text
    • http://centerbluebadge.com/75975952927pdur2.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/fomaralunex/wafamonolefaviseretig.pdfIn PDF document text
    • https://s3.amazonaws.com/zulezov/37875802844.pdfIn PDF document text
    • https://920f4c01-5fd6-4c40-8b27-b99972fecb60.filesusr.com/ugd/d63aaf_042b3265e98b48b6a35957b0cac7b993.pdf?index=trueIn PDF document text
    • https://c064424b-11a8-4e39-a524-24a74bcd733d.filesusr.com/ugd/54e393_b220c1b6f4174568bf097a5519afd14d.pdf?index=trueIn PDF document text
    • https://2efabd41-1f95-43d0-8245-5f8eb9267247.filesusr.com/ugd/2f4ddf_26633c98dfac44c6b58038ebdb754578.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/kakef/semubim.pdfIn PDF document text
    • https://7095e710-59ac-4d27-8a5a-f3bbcaf65deb.filesusr.com/ugd/418e76_35c18505ecdd4ae68813d8f92be3e756.pdf?index=trueIn PDF document text
    • https://75a697d3-84f0-44cf-bab9-f05e37020c50.filesusr.com/ugd/7c3584_8cc7519cc32641d79fc213c2e1cfe593.pdf?index=trueIn PDF document text
    • https://0c241ebc-151b-48bf-a4db-a9f2ee65d67b.filesusr.com/ugd/c17081_f786d583bcfe4d8c8020ace51741e457.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/seriposuj/definicion_de_funciones_trigonometricas.pdfIn PDF document text
    • https://18d8f76e-0bdd-4b96-b744-fee987eed1b0.filesusr.com/ugd/1486c8_72d9740d2ddb4341af160412fb1bde89.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sajezife/nefurizufasifalotilowo.pdfIn PDF document text
    • https://aed022ca-8a9d-452d-9022-56a74a585a14.filesusr.com/ugd/4d548e_1182b193f19647bfa95cdff17306e523.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_off00015885.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15885 5348 bytes
SHA-256: 5de603c11adb0d064d634dbdce50de84929e898171f42dcd95a333ebbcded35d
font_01_sfnt_off00016aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16AA1 12000 bytes
SHA-256: 1cdc801e86e0f919e0a2e12d5319ee5ebb6757ebb3896f3e2660899527f97554

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