Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4727916cf6cdd41…

MALICIOUS

PDF

80.1 KB Created: 2021-03-05 10:43:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: eceb1c8b9a70e8a08cadb9955aeb9333 SHA-1: c0c3290b3bb0e665cf432ada4a2b01ec4f856d5b SHA-256: f4727916cf6cdd4116207c60c4b4443f34e080dd674651c8c419f68c1522abb6
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO manipulation or to distribute malicious content. ClamAV and ML classifiers flagged this file as malicious, specifically as a phishing trojan. The presence of a link farm suggests an attempt to lure users to potentially harmful external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://soxebez.ru/wb?keyword=thinking%20map%20examples PDF link annotation
    • http://joxitikoki.getenjoyment.net/cloud_security_alliance_certified.pdfIn PDF document text
    • http://sibatike.getenjoyment.net/22246869583.pdfIn PDF document text
    • https://fezapatinegu.weebly.com/uploads/1/3/4/2/134266508/c69237d0a4b.pdfIn PDF document text
    • https://nalivugubogepa.weebly.com/uploads/1/3/0/9/130969323/fetijudadesimi_pojulibug_gasex_nuvibusarem.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1c684d3d-b1aa-4d58-8f8e-408f9cf37fac.filesusr.com/ugd/64d889_7cb3c44e438d43dd810b7e04e83232cc.pdf?index=trueIn PDF document text
    • https://47ab6ce1-aee6-4086-a8e7-31fe393d2411.filesusr.com/ugd/afbef4_d0cd45ef600a46c69885053f03cedae6.pdf?index=trueIn PDF document text
    • http://liroporuki.myartsonline.com/demuzupuripapunojisa.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/chromosomes_genes_and_dna_worksheet_answers.pdfIn PDF document text
    • https://121f8fc1-d270-4171-a721-8ccd656fc20f.filesusr.com/ugd/2ca22b_ce354cfc746b480bbc600baff14b9c6d.pdf?index=trueIn PDF document text
    • http://kavibajegis.onlinewebshop.net/how_to_cook_baby_back_ribs_on_slow_cooker.pdfIn PDF document text
    • https://s3.amazonaws.com/tutasujal/56116088499.pdfIn PDF document text
    • https://s3.amazonaws.com/tokit/traffic_rider_apk_android_oyun_club_hile.pdfIn PDF document text
    • https://s3.amazonaws.com/lorerexeg/50041266819.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/jeluduxutuve.pdfIn PDF document text
    • https://s3.amazonaws.com/banula/27443839963.pdfIn PDF document text
    • https://4454cc88-256b-48ad-9013-c0414c72072d.filesusr.com/ugd/67e251_f14e79e5ad6644109ae9ae4362f6cb20.pdf?index=trueIn PDF document text
    • https://d99d9bf7-a5e0-49f2-90ac-0d1bc881463d.filesusr.com/ugd/0182ef_91ee98d141ae4931af466210e9c4ebfb.pdf?index=trueIn PDF document text
    • http://zoligagomuwe.onlinewebshop.net/58686794051.pdfIn PDF document text
    • https://6cdf8c5e-36a0-4b6d-987f-32d3d50030cd.filesusr.com/ugd/3c2e2e_494eda73cba042afaa211758e31f5123.pdf?index=trueIn PDF document text
    • https://d102a0f2-001f-4998-bb0a-88ac30ac05b5.filesusr.com/ugd/771ea4_11c73ff9dc804c3998153c65d76d7703.pdf?index=trueIn PDF document text
    • https://29159626-56e2-4eb2-a8c1-eb081f451e44.filesusr.com/ugd/a58502_878e24931aa449529e2bb4703ae2ead0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gazijewevan/juvodoruk.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_off0000fd77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD77 5216 bytes
SHA-256: f2611fad7d6601b97547931d99f383326f86da5236fcf32ed3505d583c673c81
font_01_sfnt_off00010f1c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1C 10600 bytes
SHA-256: 9c5cafb3f885a179f04c870e65da9d3037a4f6c687322b860de2543824e1a51f

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