Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bb409fb22a1bcb7…

MALICIOUS

PDF

86.8 KB Created: 2021-03-27 16:40:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 26acc541bb56fe8c9cfaae23ab89c447 SHA-1: 9f169f665398a3816e277cd34c0be8bd2ee8250c SHA-256: 4bb409fb22a1bcb7bf589399a50a06fce1de58b8e2cf6631d8231cf72de5740e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, forming a link farm designed to direct users to potentially malicious websites. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as phishing and trojan activity. The embedded URLs suggest an attempt to redirect users to download further malicious content or engage in phishing activities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/award?keyword=ap+sachivalayam+digital+assistant+notification+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417530/normal_5febbe3103a80.pdfIn PDF document text
    • http://drnextact.xyz/dafigedafrr8c.pdfIn PDF document text
    • https://negofugino.weebly.com/uploads/1/3/4/5/134529575/689a73777d61.pdfIn PDF document text
    • http://sovetnik53.ru/77183011063rhqt0.pdfIn PDF document text
    • http://edayafar.xyz/wijubunegopamwtj3x.pdfIn PDF document text
    • https://terifurarogo.weebly.com/uploads/1/3/4/3/134317228/8189795.pdfIn PDF document text
    • https://watinamubil.weebly.com/uploads/1/3/0/8/130813586/zuvabiteke.pdfIn PDF document text
    • https://tobejisexin.weebly.com/uploads/1/3/1/4/131454505/5e4f4949c.pdfIn PDF document text
    • https://biwomewiwuxe.weebly.com/uploads/1/3/4/1/134131409/romav-pijag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391636/normal_601421c044e19.pdfIn PDF document text
    • http://segwaywheelchair.ru/mopepelisaligibokiponimo54t1v.pdfIn PDF document text
    • https://juzowugaf.weebly.com/uploads/1/3/4/7/134773334/ec0a891e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4455405/normal_5ff650071cd2d.pdfIn PDF document text
    • http://neo-tp.ru/97858351857oc13.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/litunux/56839208994.pdfIn PDF document text
    • https://s3.amazonaws.com/bulolimepol/whirlpool_gold_series_dishwasher_cleaning_cycle.pdfIn PDF document text
    • https://s3.amazonaws.com/gowupuzokowuxes/dual_luciferase_reporter_assay_quick_protocol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ed0e048-1595-4617-afeb-0acef7951974/xavalofabud.pdfIn PDF document text
    • https://s3.amazonaws.com/tuxutedi/pesquisa_qualitativa_definio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c4ead2c1-1ba1-4067-9a2f-77dfc874b1f4/bijamikivufuraguta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac41d5f3-4451-4b4c-a67f-c1a6234612f1/83400164595.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/bifatuxawob.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010887.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10887 5292 bytes
SHA-256: 223d14d27a5fe3362002b5cfc8c8969dea0012fa3a27f5571529fd89a9201472
font_01_sfnt_off00011a6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A6B 10824 bytes
SHA-256: ffbeab1aa27c240f4fd57feef6db51c822949d6926a69c939827180fbed37a35
font_02_sfnt_off00013f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F54 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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