Malicious PDF — malware analysis report

Static analysis result for SHA-256 f24bd71e596cfb8c…

MALICIOUS

PDF

70.5 KB Created: 2021-02-18 14:32:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 3128f28d5a279d993771c3ec907c3228 SHA-1: 32d656134ba4db8019c0c924a8fb64d865696c5e SHA-256: f24bd71e596cfb8ca6c76a9ca5a117c0be23bb2a6a7807f11e7bac1377bcad99
156 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a malicious document, likely delivered as a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://jacksth.ru/strik?utm_term=written+argument+format+pdf PDF link annotation
    • https://padamiraniz.weebly.com/uploads/1/3/5/3/135305831/7749977.pdfIn PDF document text
    • http://fsbsiod.com/string._format_java_long0pmd7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4420030/normal_6000e437a767b.pdfIn PDF document text
    • https://gabinomila.weebly.com/uploads/1/3/4/7/134763369/9120194.pdfIn PDF document text
    • https://funemozivadomuz.weebly.com/uploads/1/3/1/3/131398429/kubufuxofu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374185/normal_5ffe431289dd2.pdfIn PDF document text
    • https://gimituwemowi.weebly.com/uploads/1/3/4/8/134872285/rozenovuzo.pdfIn PDF document text
    • http://lifeshop.pro/61351296709xszh0.pdfIn PDF document text
    • https://lovemaxo.weebly.com/uploads/1/3/3/9/133997317/gazovojure.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411489/normal_5fe007fb1ef78.pdfIn PDF document text
    • http://dulexip.22web.org/99708309229.pdfIn PDF document text
    • http://probmaka.tech/86444718406w4g69.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/kulinisokakewi/gijusitafupuzatomukujibej.pdfIn PDF document text
    • https://s3.amazonaws.com/gafedupeba/jevorobomowobidumoxu.pdfIn PDF document text
    • http://vibesegajepo.epizy.com/jiwonuwaralinexalugagadew.pdfIn PDF document text
    • https://s3.amazonaws.com/ginutu/unbreakable_kimmy_schmidt_season_1.pdfIn PDF document text
    • https://s3.amazonaws.com/kukupunopedon/60223115020.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_off0000cc2c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC2C 5048 bytes
SHA-256: 93301e4c872101c16022f790e34da04638ffe11d6a631fdfa2de9ce54417733a
font_01_sfnt_off0000dd46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD46 9840 bytes
SHA-256: d037b9ae6b6b10d1f41594a8ecb997d00d61643c45010205e1c801439d69a22f
font_02_sfnt_off0000fef8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF8 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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